Thick rubber washers supplies

[slim_boy_fat]

I was actually being a smartass, quoting Seadog, as he forget to put a pic or a link.

Ditto

 

[fizzy]

For thinner rubber washers and gaskets a good source is old tyre innertubes - my local tyre place are always happy to give them away.

 

[Onoff]

I've some I think 15mm rubber sheet here I could Starrett a few out of.