If the average Joe is worried about the reverse squish, he can slap a piece of sticky back sandpaper on an old piston of the same MM bore and level it out if it's just a fuzz. I've done a few with my ''redneck'' machining skills. I chuck an I bolt in a drill, put an OLD piston on the end with the wrist pin slid through the eye in the I bolt. Stick a piece of 80-120-220 whatever grit sandpaper on the crown and spin it slowly till the reverse taper is gone. No It's probably not the correct way to do it, But it works fine for a hillbilly that's short on tools. It doesnt scratch the bore up either. Done several like this and they turned out good, but I wouldn't try removing much....I'd say less than .005 in my worthless opinion would be max I would go.