I ordered a replacement drive coupler from AppliancePartsPros. It came in two days. I then carefully removed the remaining pieces of heavy rubber from the old drive coupler, still on the blender, with a small pliers. Then, with a wide, flat blade screwdriver, I slowly bent upwards the edges of the remaining aluminum disc of the old drive coupler, working around the coupler slowly, several times, so as to not disturb the main part of the blender. This loosened up the screw threads from the old drive coupler, allowing me to then unscrew it with just my hands. Pretty easy. Screwing the new drive coupler on (reverse thread direction, of course) was a cinch.