Thanks for posting this. I had a similar problem with mine… it wasn’t orbiting, and tended to hop when I was using it on a flat piece of plywood. Took it apart like you did, and found that the clear belt was on, but that little wheel was cinched down so tight that it was also cinching the belt. I eased off the screw just a bit and it freed up the belt and allowed the little wheel to turn. Worked fine after that.