Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

My thoughts exactly. I’ve ordered a piece of Teflon Ptfe from eBay.

I had low compression on the front cylinder of the Knucklehead.The piston o-ring apparently was pinched during assembly. When replacing the ring I noticed the scoring in the cylinder wall. Enough you can feel it with your nail. So I took the old ring and cut it in smaller pieces and fit it into the piston pin opening on each side. I’m pretty finicky about things.

When I get the Teflon I will cut the discs and put them in the R31.