On Sunday, after complete disassembly - following excellent video instructions - the motor was almost frozen up. No oil would cure that. Ordered new motor and new belt (why take it apart and not make sure everything else is good). Checking for good rollers and all was fine. I ordered parts and left Monday morning for knee surgery to re-attach knee cap on new total replacement knee joint.on Monday.. Came home Tuesday and motor arrived Wednesday. With wife's assistance mechanical ability 50%), re-assembled and all is well. Fantastic instructional video. Only tool missing was snap right pliers and 11 piece set from Harbor Freight cured that