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Snap-Caps™

The original Cap & Washer screw covers

Snap-Caps ( aka "Dome caps" or "UniCaps") were developed more than 40 years ago, and are still the best and most secure way to cover and protect screws, fixings and fasteners.

Snap-Caps:

  • protect against injury from damaged and burred fixings
  • encase the screwhead in an air & watertight seal,  preventing corrosion 
  • The security of this seal also makes the caps tamper-resistant
  • can save you time, effort and money by allowing use of cheaper fixings and more simple fixing methods.

Prices from just £13.30 (per bag of 1,000 caps or washers)
(Click on PRICING tab for details)


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How do Snap-Caps work?

Snap-Caps are a 2-part product, comprising:

  • a plastic washer (base), through which the screw or other fixing is inserted, and
  • a plastic cap (dome), which locks over the washer, providing an air & watertight seal that protects the fastener head from rust and corrosion. 

Snap-Caps are available in three sizes:

  • Size 4/5 suits 4gge to 5gge (Metric 3 – 3.5);
  • Size 6/8 suits 6gge to 8gge (Metric 3.5 to 4.2); and
  • Size 10/12 suits 10gge to 12gge and ¼” (Metric 4.5 to 6)

With 96 colours and your choice of Gloss or Matt finishes (all held in stock in the UK), Snap-Caps can match 1000's of materials, including laminates, composite panels, paints, fabrics, powdercoats & vinyls used in the UK - making Snap-Caps a very cost-effective way to not just hide, but also protect your fixings.

CSK Washer F/B Washer

The Snap-Cap washer is available to suit either Countersunk screws, or for any of the ‘Flat-Bottom’ fixings (such as pan-head screws).  Using the correct washer type will support your fixing properly, giving improved clamping performance and prevent the screw distorting the washer - crucial to why genuine Snap-Caps are the ONLY cover caps that COMPLETELY seal the head of the fixing.

How to use Snap-Caps

The fixing is secured through the washer into the workpiece. The cap is then "snapped" over the washer, mating by means of an interlocking peripheral groove and flange. This provides an airtight and seal that excludes atmosphere and protects the fastener head from rust and corrosion.


Why is the airtight seal important?

It all has to do with how gases and water vapour behave in enclosed spaces, and is governed by a few Laws of Physics, such as Boyle’s, Charles’, Dalton’s & Henry’s. In essence, once water enters a space (because it is not sealed properly) instead of the water evaporating out again later, it becomes water vapour and remains in the space for a much longer time.

In a climate such as the UK’s, this means the screw-head is continually in water & oxygen environment, never getting to dry out properly. This can cause the fastener to corrode (rust) up to 20 times faster than if a cap had NOT been used!

This effect can be easily confirmed, by examining vehicles that use hinge-caps over the number-plate fixings. Even on cars less than 6 months old, zinc-coated screws will show signs of advanced corrosion.

Similar issues arise with ‘polytop’ style plastic-coated screws. Often the plastic coating will crack as the screw is being tightened into place. Water can enter these cracks and cause accelerated corrosion, resulting in visible rust streaks.

 

Uses & Applications

Because they are UV-stabilised and completely seal the head of the fixing, Snap-Caps are ideal for exterior as well as interior applications. Even in extreme environments, Snap-Caps can be expected to last for 10-15 years, all the while protecting the screwhead against corrosion.

Snap-Caps are used in the following industries:

  • Aluminium frames (showerscreens, windows, doors and wardrobes)
  • Shopfitters
  • Caravans, mobile homes & transportable homes
  • Boats (from small runabouts to Navy frigates, high-speed ferries and ocean liners)
  • Signs
  • Vehicle number plates – specific colours are available to match UK front and rear plates
  • Cabinetry (concealing all types of fixings, incl. the screws used with door handles and knobs)
  • Furniture upholstery
  • White goods
  • Electrical and signalling control boxes and panels (Snap-Caps are an excellent way to insulate fasteners)
  • Other vehicle applications – buses, trains etc, Horse floats and other trailers
  • Aircraft – private and corporate aircraft up to BA 777’s and Airbuses
  • Aftermarket decoration of motorcycles, SUV’s, lorries and HGV cabs

WARNING: Variations between monitors means the colours will not display 100% accurately.  This Colour Chart should only be used as an indication of the colours available in our colour range. Please do NOT use this chart for color matching purposes. For further information, see Important Notes below.

This swatch is only to indicate actual colour.

White

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Off White

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Crystal

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Bone

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Cream

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Antique White

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Magnolia

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Almond Ivory

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Almond

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Marl Beige

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Sahara Dune

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Beige

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Stone Beige

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Rose Beige

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Driftwood

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Walnut

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Desert Dusk

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Horizon Cream

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Buff

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Myrtlewood

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Honeymaple

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Mustard

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Orange

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Caramel

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Suede

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Coppertone

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Woodrose

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Teak

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Metallic Brown (M)

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Mahogany

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Sandalwood

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Chocolate

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Brown Bronze (M)

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Hamersley

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Weathered Copper

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Sepia

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Old Burgundy

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Auburn

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Blaze

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Red

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Mandarin

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Mt Olga Orange

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Coral

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Rose Ash

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Aubergine

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Greige

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Heather

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Fuchsia

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Buttermilk

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Harvest

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Banana

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Yellow

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Gold

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Brass (M)

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Copper (M)

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Avocado

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Anodised Bronze (M)

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Heritage Green

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Teal

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Forest Green

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Fern Green

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Lime

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Shadow

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Pale Sage

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Ocean Grey

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Citrine

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Indian Sage

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Cactus

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Pistachio

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Aqua Blue

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Cloud Blue

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Blue Grey

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Shadowart

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Windsor Blue

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Sky

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Sea Blue

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Aqua Sky

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Turquoise

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Reef Blue

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Mill Blue

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Caspian Blue

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Space Blue

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Royal Blue

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Slate Blue

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Navy

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Black

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Medium Slate

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Charcoal

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Wedgwood

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Silver Grey (M)

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Fog grey

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Light Grey

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Morning Grey

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Oyster Grey

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Aluminium Tone

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Mist Grey

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Important Notes:

  1. Colour Chart is intended only as an indication to the colours available.
  2. Whilst all possible care has been taken to ensure the best colour reproduction possible, variations between monitors means the colours will not display 100% accurately.  Please do NOT use this chart for colour matching purposes.
  3. To ensure you select the best possible colour match, you should use the Colour Matching Guide or ask for samples before ordering.
  4. Pause mouse over colour swatch to check stock availability.
  5. Colours marked (M) are a metallic colour - they have a metallic "fleck" throughout them, similar to metallic car paint. They should not be confused with the Electroplated- finish Snap-Caps

 

Material

Snap-Caps are manufactured in Polypropylene.  All materials used are 'food-grade' quality.

Snap-Caps Dimensions

 

What types of fixings will work with Snap-Caps?

This table indicates some of the different types and sizes of fixings that can be used with Snap-Caps. It is by no means definitive, and there are numerous examples of imported fixings that are sized differently enough to not fit. If you have any additions to this table, or disagree with any information, please contact our Technical Department.

Real comments by real people!

CoverCaps RAL 5011

Michelle
From Lancashire
On: 17/11/2017
Fast efficient service, product colour a good match against our existing

Silver Grey & Blaze Snap Caps

Nick
From Ace General Engineering (Cornwall) Ltd
On: 12/09/2017
Very happy with the Snap Caps ordered from Screw Caps UK last week. The Silver Grey & Blaze colours matched up really well to the powder coated cladding we were installing. The Snap Caps are a really easy way of covering up screw heads and are so easy to install. Wouldn't hesitate to recommend these screw caps and the service provided by Screw Caps UK.

Good Service

Helen
From National Trust
On: 14/07/2017
Goods received in next days post and sales staff were helpful and friendly. Would use this company again.

Miss

Saadet Mounir
From T & E Signs (UK) Ltd.
On: 18/05/2017

Your sales person was absolutely FANTASTIC! She was SO helpful and her product knowledge was impeccable. She made it so easy for us and honestly I'd love to order with her again. I'll be asking for her specifically! I'm one very happy customer! THANK YOU!

Edited by WebAdmin to remove Employee names.


Duty Manager

Carol
From Wookey Hole Caves
On: 02/04/2017

This was a great fast service.Staff were helpful to match up the coulours with our sinage. Lots of choose.


Snap caps

Pinnacle
From Pinnacle
On: 23/01/2017

Very quick delivery. Excellent product. Great range of colours. Suited our purpose exactly. Good price too!


Director

Mark Brooks
From Digital Deadline
On: 19/01/2017

Great product with a wide colour range and good size options, fast delivery, great price and very helpful customer service, would definately recommend giving them a try.


Great Service and Great Product

Alessio
From London Architectural Glazing Ltd
On: 23/11/2016

Great service from start to finish. Quality product and large colour selection. Will use it again.


 

Bob
From Keighley
On: 21/10/2016

The staff was very helpful and efficient The snap caps were used to cover the screws which hold the toilet down and were just what was required. Excellent job


great product snap-caps

andrew loveday
From Amey rail ltd
On: 17/10/2016

Great service from start to finish, good range of colours, Order packed all ready to go when collected, friendly staff, will use again


Great product

Luke Gilman
From GBS
On: 22/03/2016

A great product and next day delivery every time. We are very happy with the service from Screw caps UK.


Good product, excellent service

Amanda
From PCC Interiors Ltd
On: 19/11/2015

Efficient service, helpful staff & a great product.


Fantastic product range

Richard
From Reflex
On: 30/10/2015

Couldn't be happier with the snap caps. The range of colours is outstanding and we managed to match our clients red and a bronze metallic! perfectly. We wouldn't usually use screw fixings to secure our graphics as our client demands such a high quality finish but having had issues in the past using high bond tapes at this particular location the snap caps were the perfect solution. The sample pack to choose colours is great, it contains all the colours and all the different styles available. Service is fantastic from the staff and delivery is next day.


Buyer

Richard Fletcher
From Wood & Wood Signs Ltd
On: 11/08/2015

Good product and delivered promptly, chosing a colour was easy from the sample pack, ideal when matching to an existing sign.


 

Rob Ferns
From Dorset Conservatory Blinds
On: 26/06/2015

Fast and efficient service, good product (snap-caps)


Mr

John
From United Kingdom
On: 05/05/2015

Very heplfull and speedy service. Was supplied with a colour matching sample pack before I chose the cap which made colour matching easy.


Fast Delivery

Scott
From Morris Homes
On: 05/05/2015

Very quick delivery, very efficient. Havent used the product yet but so far so good


Excellent service

Marc Fisher
From M & S Interiors Ltd
On: 22/04/2015

We placed an order on a weekend using the downloadable order form which we printed off, completed, scanned and emailed back across with our card details. The order was acknowledged and a query as to whether we wanted matt or gloss finish was emailed which we replied to. The next day the materials all arrived along with a sample pack which is a great help to us now for choosing the best colour match to our furniture. Will definitely be using over and over again.


Great product and service.


From Greatwood Jenkins Ltd
On: 02/04/2015

I spoke to a helpful guy on the phone who was very enthusiastic and helpful about the range of Snap Cap products. We bought a pack of caps and the sample chart. Very prompt delivery and great customer service. Wouldn't hesitate to use them again.


Friendly and prompt service

Dawn
From Lee Warren Ltd
On: 31/03/2015

I have had no complaints with the Snap caps brought so far ( and that has been a few thousand). The price is good and delivery always on time with a friendly and prompt service.


Perfect for the job

Georgina
From Beaufield Homes Ltd
On: 28/03/2015

Very prompt and friendly service. The caps did the job. The comprehensive colour chart pack is very useful for getting a colour match. Definitely use SnapCaps again.


Professional from placing an order to delivery

Michelle
From Spaceright Europe
On: 27/03/2015

Fantastic customer service from placing an order to delivery. Their knowledge has helped our company choose the most suitable caps for our business. Highly recommended


Caps that actually work.....

Dave Metcalfe
From Wilton Signs
On: 27/03/2015

Great product and very good customer service. Our order came out the same day and arrived the day after.


....give the finish we really care about

Nerys
From Signspeed
On: 13/08/2013

From start to finish the service was professional, prompt and friendly. The Snap-Caps will definitely be regular additions to the signs we produce, as they give the 'attention to detail' finish we really care about.


Much better than Hinge Caps!

Chris Bannerman
From 4Site Implementation Ltd
On: 20/03/2013

I like the Snap Caps because they don't pop off unlike the hinge caps.   We received great service, and love your large colour range and good choice of products. Price is fair too.

 

Thank you for your interest in Snap-Caps.

Due to the range of colours and finishes available in the Caps, and the different styles of Washers available, Caps & Washers are priced and sold as separate items.  Trade Prices are from:

  Sizes 4/5 & 6/8 Snap-Caps Bag - 1,000 pcs   Size 10/12 Snap-Caps
Bag - 1,000 pcs
Caps - (all colours)* £13.30   £13.90
Washers - £13.30   £13.90

* All colours (excluding Electroplated Snap-Caps) are the same price.

***  To order quantities of less than 1,000 caps of any colour, please contact one of our Re-Sellers.

 

Discounts available:

    10% OFF - Order £100 or more Product Value (excludes VAT, and can be made up from any mix of our products & colours)
    15% OFF - Order £250 or more Product Value (excludes VAT, and can be made up from any mix of our products & colours)

We are still developing our on-line ordering system.  With so many types of caps and colours to choose from, our priority is to ensure you order the right product, size and colour for your application.

Please call our experienced UK Sales Team on 0845 1 776 332* , and we will quickly guide you through the possible choices you have available.  You can then be confident you are ordering the type of cap that best fits your needs, and a colour to best suit your application.


*  Calls to this number from BT landlines are Free

Working in Winter - Using Snap-Caps in Cold Weather

Snap-Caps are designed and moulded to very fine tolerances.  The Cap & Washer interock together with a perfect air and watertight seal, protecting the head of the fixing against rusting for many years.  This also results in a very secure Cap that resists tampering.

Both cap and washer rely on the plastic distorting as the cap locks over the washer.  As the plastic become colder, it stiffens and does not flex as much.  For the type of plastic used for Snap-Caps, these changes to the behaviour of the plastic are most noticable when the plastic is below 15°C.

Fitting the Cap to the Washer may require more force.  It may also result in a white 'stress' ring forming around the perimeter of the cap. The white ring may disappear over time, especially if the caps are warmed up.

The Fix: Before using, simply warm the caps in an 'inside' pocket (ie close to your body), or in an oven or similar warming device to a maximum of 100°C. Once fitted, Snap-Caps can endure temperatures from -35°C to 120°C without problems. Because Snap-Caps are UV-stabilised, they can be used both indoors and outdoors.

 

Difficulty "snapping" the Cap onto the Washer

If you experience difficulty in locking the Cap over the Washer, and/or a White 'stress' ring (or halo) forms around the perimeter of the cap, there are a number of likely causes:

  • The Caps are too cold, and the plastic will not flex

The Fix: See "Using Plastic Caps in Cold Weather" (above).

  • The fixings you are using are too large for the Washer.  This prevents the Washer from flexing as the Cap is being pushed on.

The Fix:

  • Ensure you are using the correct-sized Snap-Cap for the fixing.  Some imported fixings may not conform to British or EU standards, and the heads of the fixings may be up to 40% oversized
  • Ensure you are using the correct Washer type for the head of the fixing - you MUST use a CSK Washer with Countersunk-head fixings, and F/B Washer for all "flat-bottomed" fixings such as pan-heads, flange-heads etc.
  • Try the Snap-Cap with a smaller fixing.
  • You are not using the correct technique to fit the Cap to the Washer.  Because Snap-Caps are designed and moulded to very fine tolerances, the caps cannot be pushed on "flat".  Do NOT hit Caps with a hammer (or similar) - it will cause the Caps to split

The Fix: Use the correct fitting technique.  Click diagram for details.