Once I've got the piston diameter up to where I want it, and before I loosen up the chuck, I give the skirts a quick shoeshine with 240 or 320 grit abrasive cloth. I keep rolls of the stuff nearby for polishing the parts I turn.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!