Michael H Cataula , GA February 23, 2015 Appliance: Whirlpool Undercounter Dishwasher DU930PWPB2 Whirlpool Dishwasher Du930pwpb2: Sprat arm nut sheared off after 7 years. How to replace Ring Bearing. Ordered new sprayarm nut, ring bearing, and nylon radial ring bearing. Removed old parts. Installed new parts and dishwasher worked like new again. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes