Worth carrying a few spares and putting them on cars next time at the NCP carpark
you can send em off to be made into belts n stuff can't you?
I use tyres for belts, and inner tubes to make bags:
View attachment 26692
They are also useful for masses of things - bungying stuff to stuff, cut up to make shims etc. I'm working on a wallet, just need to master sewing them.
Decent sewing machine should do you shouldn't it? something that can do heavy duty material?
looks good tho