Carl M Evanston , WY October 10, 2021 KitchenAid pro 6 mixer locked up. I replaced the gear kit that drives the accessories. About 12 months earlier I replaced the worm follower gear. I would suggest replacing both gears while you are in the gearbox. Don’t forget to order the grease for it. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours