Last week someone mentioned that it was wise to turn a piston slightly undersize above the top ring to help getting the top compression ring on without breaking it. I've been playing Mr. Mechanic for almost 75 years, and I've never heard of that. Has anybody else heard of that, and if so, how much undersize do you turn it. I am dealing with a 1" diameter piston (actually 0.998") dia.) and it's up on my lathe right now.---Brian