James S Cunningham , KS December 04, 2022 Appliance: KitchenAid 5 Quart Artisan Tilt Head Stand Mixer KSM150PSER0 Kitchenaid Mixer Ksm150pser0: I was missing two pieces to my Kitchenaid mixer. How to replace Thumb Screw. I ordered two parts a Hubcap and a Thumb screw for my KitchenAid and it was really easy to install. I will do business with them again when I need it. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes