Terry H Pasadena , MD August 24, 2015 Appliance: KitchenAid Blenders KSB5WH0 Kitchenaid Blender Ksb5wh0: Blender coupler wore out. How to replace Insert Seal. Replaced it after watchig video on how to do it. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes