I've never "sleeved" a cylinder before - but I figure it's a good skill to have. You can buy cylinders a lot cheaper if they're already .070 over size and rusty. The 4-fin knucklehead cylinders, '48-'49 panhead cylinders...anything that has the original date codes and markings. Restoration junkies need the original parts for judging points and originality. Plus, they just look right on an engine. It was my first attempt, it's in there, and I can bore it now, and use my NOS +.010 over H-D pistons.