I do not plan on turning down any flywheels. I just wanted to see if it fit in. I may bore a flat spot for a hub to seat against. Most flywheels only need a little more clearance for hub to seat good. I know I could taper the hub adapter down some...but I like the full dia I am using. More surface contact. Also I have been saving crankshafts to cut off. I plan on cutting the center out of the flywheel with a hole saw (works nice) and the mount the center part on a crank shaft in Lathe. Then I can tru it up. Photo for that later. Keep the good tips coming....it really helps. Capt,n