… can be used for lots of applications. Harry used it for a modification on his shoes.
Today I used it to replace the worn out rubber ring on the left suspension.
So don’t waste your old Marathon Plus tyres, but keep them spare for all kind of tips&tricks you’re not aware of now. You can find some ideas for old inner tubes on this site ; although I’ll never need number 19 😉 
Wim Harwig 