David G Louisville , KY June 21, 2014 Appliance: KitchenAid 5-Speed Blender KSB5OB4 Kitchenaid Blender Ksb5ob4: The drive coupler was "chipped". How to replace Blender Drive Coupler. After watching a video on how to remove the chipped drive coupler, the removal of the old coupler and replacement with the new one took about 10 minutes. One of the easiest repairs that I have ever done. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes