Jim S Paulden , AZ April 15, 2018 Appliance: KitchenAid 5 Quart Stand Mixer KSM150PSER1 Kitchenaid Mixer Ksm150pser1: Speed governor not working and spring control plate was not working right. How to replace Control Plate Spring. It was very simple after watching appliance parts pros. com on u tube. they were very helpful in showing the right way to get the parts put in the right and easy way Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes