I keep stumbling across various mentions of hand lapping piston and sleeve to reduce run in time.

Has anyone actually tried this with any success?

I did a little quick research on hand lapping and came across info on 1/1 scale valve lapping that is apparently a stone age technique for service cyl head.

However concept seems interesting where you are hand fitting the two conical parts together..again sounds basically like what happens when you run in a nitro engine.

Anyone?