RE: Replace the Cylinder or just the ring on a Saito rebuild?
About 10 years ago I had an instructor that was working for Horizon doing the engine warranty work. He is the one that showed me how they used a oooo steel wool on cylinders to remove the castor glaze. Not honing or sanding, just cleaning. If a piston ring doesn't score the cylinder then oooo steel wool isn't going to harm it. I have only had to replace one sleeve and it was in a YS 1.10 that sucked up a big bunch of sand and was run again before cleaning. Other then that I haven't seen a cylinder or sleeve that required replacing from wear from running. They seem to last forever and a day.