Well we have always removed the sheave, but now that you mention it, one could unscrew the drive stud, rotate it away from the belt, set to widest setting, heat the bushing while running water on the hub area and use a bushing puller or make one from a nut that had the corners ground to the od of the bushing, insert all thread from the outside and screw into the bushing placed between the sheaves and use a nut on the all thread outside to pull the bushing and puller out through a spacer and washer also mounted on the outside. Gee, if you can follow that you are better than the person I have looking over the shoulder trying to figure out what I just said.