Bob O Centreville , MD December 07, 2014 Appliance: Whirlpool 4 1/2 Qt. Stand Mixer Classic - Tilt K45SSAC-0 Whirlpool Mixer K45ssac-0: Beater wouldn't turn. How to replace Worm Gear And Bracket Assembly. Customer had jammed the beater and stripped the worm gear. Played it safe and replaced the entire bracket including worm gear, drive gear and bushings. Parts fit perfectly. Received parts in two days, as usual! Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours