I took my disassembled high compression 65 to my part time job in the CNC lathe shop this morning. The owner spent an hour looking over all the parts. This guy loves stuff like this. Looking at the top of the piston under magnification we could not see any file or machine marks. Could this piston have come from Saito this way? We found a collet that will fit the piston. As soon as one of the CNC Mazak lathes is free it is going for a trim. The collet pressure will be turned way down. I am tempted to just use some emery cloth on the ragged part of the piston. If we do use a cutting tool I will let the shop owner, do it. Any suggestions????