Originally Posted by Roelof

Take a search in the Offroad engine section to "hand lapping", is is a common thing to do. When I do it I use a Scotch brite pad which is a kind of polishing pad. Some have made an holder with an hole where you can put in the polishing pad and the piston and an adaptor so you can connect the rod to an electric dril/screwdriver

The chrome layer is very hard and many microns thick, with very tight engines after one or 2 races I sometimes use a brake cilinder hone stone to work on the sleeve. I makes the sleeve a tiny bit larger but it also makes a fresh hone profile (scratches) what will hold the oil much better for a better lubrication and compression build.