Need to have a fly wheel turned on outside diameter and rim edges two ( ea. ) # 60 surface finish, fly wheel approximate 11 inches casting ,bore HOLE FOR SLIDING FIT FOR .625 SHAFT also put in 1/4 20 setscrew hole for grub screw 15 degree angle thread not necessary.
The set screw will be centered on the hub either side does not matter , all sizes are as they just clean up to remove casting flash ,clean up center hub, face both end's no clean up on the diameters of center hub.