How do I replace the casing and sleeve on my fastener?

A zip consists of its teeth and its slider, but we tend to overlook the importance of the stop points, both top and bottom. It is clear that problems with zips can arise not only from the slider but also from its bottom stop point – in other words, the casing and its sleeve.

Zip slider

Stopper, slider, casing… it’s the ‘little metal or plastic thing’ at the bottom of our L-shaped two-way zip.

In fact, it may not look like it, but it is an essential part of the separable zip.
What are known as ‘separable zips’ include those found on coats, jackets, waistcoats, etc. The opposite of these are non-separable zips, used on rucksacks, handbags, trousers, shoes, etc. These do not have a casing or sleeve as they do not open to the point of separating into two parts.

The stop ensures the fastener functions correctly; it is its starting point. It prevents the slider from slipping and falling off. It also helps to hold the teeth of the fastener in place when closed, thanks to the support point.

Zip end cap

The term ‘end cap’ refers to the small metal (or plastic) end piece that is inserted into the zip case before sliding the slider to close the zip.

Replacing the casing or slider on my zip

When should I replace the casing or slider on my zip?

- When the metal or plastic tip has been torn off.
- When the casing or sleeve is starting to come apart.

How do I replace the casing (bottom stop) on my zip?


Remove the damaged casing using pliers.	Insert the new casing through the slot.	Use pliers to crimp the lower part of the casing onto the zip.

How do I replace the slider on my zip?


Remove the damaged sleeve using pliers and insert the new sleeve through the slot until it reaches the mesh.	Use pliers to crimp the sleeve onto the fastener.	Slip the sleeve into the casing – it’s fixed!