working on the Sears 109 mini lathe. Has been worked on before, using the term loosely. Had parts missing in the head stock drum for the back gear assembly that lowers the rpm 5:1. Got that piece made and it works good. Putting in back together I could not lock the driven 2 step pulley to the shaft. Found out the set screw did not come close to going to the shaft. Tapped hole is in the center of the 3" middle pulley. Tried to run a tap down but tap was short of going through. Found the bushings, one from each side of the pulley, had been replaced and the one bushing had been pressed in to far and had the hole for the set screw half covered. Aluminum pulley so trying to drill the bushing out would only eat out the aluminum pulley. A small screwdriver blade will just go past the end of the bushing far enough to touch the shaft. Set screw is 1/4 X 20 so can make a longer set screw but the problem is to get the bottom end opened up enough to allow the set screw to anchor to the shaft. Any suggestions ? ?