Mine started sticking at half rotation a few months ago. I took it out with the intention of just replacing it, then I saw the price and figured I should probably try and get it going. I don't think I provided a forever fix, but the shaft was pretty rough and it was binding. I cleaned it up and lubed it, and it seems to work fine now. The true test will be when there is 4 pounds of snow on it this winter.

No writeup because I was just winging it and didn't remember exactly what I did. The motor did not appear to be designed to be serviceable internally, but I'm not totally sure.