Wanted: .020 Pee Wee cylinders

Also, despite what people say about pistons and cylinders being interchangeable, my experience says otherwise. I have a few pistons and cylinders obtained in various parts lots from eBay. I keep them loose in a parts drawer and every time I want to make an engine with them I have to first try the pistons for fit in the cylinder - some are obviously far too tight - then I have to run them because it's difficult to detect when a piston is a smidgeon small for a cylinder meaning it leaks. I am going to have to go through them soon and match them up.

I would have a go at deburring or give it to Jason to do for you since he's offered.

I only found otherwise interchangeable COX pistons too tight if they had a roundness issue like
having been overhammered when the balljoint was reset. Then the piston should retire for good before it kills an otherwise usable cylinder..