If you need another Beta tester I volunteer
I have a Puch Hi-Compression head on a 66 cc BGF Z80. It's still fairly new, well, low milage. I took the clutch cover off and there was a large pile of ground off rubber I had to clean out. The pucks were worn down to the fabric. I then bought the wrong pucks
Got square and needed round.
I just might go the route of contacting McMaster-Carr, I've bought from them before. Making my own from brakeband material could be what I need...unless your ready to sell the rounds.
I'd even PAY to be a Beta tester, I think it's that important