Timothy K Laporte , IN November 16, 2014 Appliance: KitchenAid Portables - Stand Mixer KSM90 Kitchenaid Mixer Ksm90: Worm gear stripped. How to replace Worm Gear And Bracket Assembly. Removed all decorative bands. Punched pin out of beater drive. Removed all screws and pulled top off. Cleaned the excess grease away and removed the stripped worm gear. Installed new one and reassembled. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes