We accidentally destroyed the driver coupler when was not seated properly. Thge driver couple is designed to self-destruct in this instance which it did rendering the 5 speed KIitchen Aid blender inoperable. Needed a new coupler.

The shaft and the coupler are threaded. On could unthread the coupler. But many time it is frozen. The coupler is manufactured out of soft metal center and plastic. If frozen, it can be pried off the shaft using a large screw driver --- per the instructions provided with the part. This worked well with no damage to the blender power shaft. The new coupler was simply screwed on to the shaft and it works fine. The online schematics provided by PartsSelect helped me identify th part, part number and the nomenclature. The part arrive on the west coas in about four day --- very quick service. Thanks, PartSelect. Great job!!!