I inserted the new bearing by coating everything with STP then placing in a vice between pieces of wood and closing the jaws! That got the bearing in flush. Tapped it in the rest of the way, then used the metal tube to tap the bearing onto the mount (tight fit). Eyeballed the bearing in the middle of the sleeve. If it’s in too deep the roller will hit the mount, not deep enough will hit the belt shroud plate on the crank. Middle of sleeve is the sweet spot!