This MM-3 is one of the very early models when Fred started. It has the 1/2” shaft and stainless rolls. I went the cheap route and used an old Skill drill. The router speed controller works great to slow it down. I’ve found that the roller sticking came from having my base too tight. The rollers need just the slightest ability to move. I just leave the mounting bolts finger tight, solved my locking issue. I do wish they were in bearings instead of bushings. I can’t imagine having a mill work any better than this mill. I’m guessing it has had 3,500 pounds through it. I think the gap is set at .032