Charlene P Cranberry Township , PA November 17, 2015 Appliance: Model KSB50B3 The teeth on the coupler had sheared off It was really easy to find a replacement coupler just by searching with the blender model number. The how to videos made me confident I could complete the repair on my own. I ordered the part and it arrived the next day. I was able to pull off the existing coupler with a flat screwdriver and threaded on the new one in less than 15 minutes. Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes