Accessed Appliance Parts web site and easily found the required part. Most helpful was the exploded view of the ice bucket and the video showing how to replace the auger cup. That video is essential to disassemble the bucket. The comment from other users were also most helpful to disassemble the ice crusher.
However I found that when trying to remove the ice crusher blades they were restrained on the auger shaft by burrs caused by the blades re-action against the shaft. This required removing these burrs with a flat file. After trying to remove all the blades and bushings carefully to facilitate re-assembly, they became disoriented. The exploded view was helpful to get these back into the proper order but it would be more helpful if the dotted center line would be shown going through all these parts in order or another view showing these parts in order. I would suggest that when removing these parts they be slid onto a small rod to keep them in the proper order.
The new helix required running a 3/8" drill through the center hole which was filled with plastic molding "flash".