Bob rebuilds the window motors we use/need. If they work electrically but don't engage and lift window, he will sell the 3 round cylinders, done in polyurethane, rather than nylon, that lock the inner and outer gears together. He sells a 13" stick (does 10 motors) for $25. postpaid. Also has high copper content brushes for them for $10/motor set. (770-271-9627) . You can send him motors to be rebuilt also.