Surgery laid up my right arm for a spell. A trip to the hardware store yielded a 6 mm coupling nut, a 6x12 hex head machine screw, three 6 mm flat washers, and a 1/4 hex drive 5mm hex tool. I replaced the top nut in the mill with the coupling nut, then capped that with the three washers and the screw. The 1/4 to 5 mm drive fits my Black and Decker screw driver, and allows me to power the grinder at about 150 rpm. This speed, about twice what I could do by hand, cuts grind time in half. Total cost is less than $5. Plus the electric screwdriver, which should be under twenty, and will save you from carple tunnel anyway. Photos available should someone tell me how to post them.