Product review (5 stars): Cam Cup - Mystery Solved
When I found that my original drive cam cup had broken in half and needed replacement, I googled the replacement process.  Easy enough.  Ordered the part through Amazon and started the replacement process.  I quickly realized that when trying to remove the ice crusher housing from the bucket, that the auger shaft had managed to screw its way through the front side bucket housing.  The auger shaft was protruding outside the bucket which kept the ice crusher housing from popping out of the bucket housing.  Using several screw drivers, I was able to flex the plastic bucket housing enough to finally pop the auger and ice crusher housing out of the bucket.  Replacing the drive cam cup at this point is a no brainer but, correcting the problem with the auger shaft screwing through the housing again was another story.  I removed the C clip that was securing the plastic auger nut and was able to remove the entire auger assembly from the ice crushing housing.  Then I screwed the auger nut on the shaft out to the end of the auger shaft until it was flush with the end of the shaft.  When the auger shaft was reinstalled in to the ice crusher housing with the C clip reinstalled, the shaft was flush with the housing allowing it to pop in to and out of the bucket housing easily once again.  Now to stop the auger shaft from screwing right back through the bucket housing again, I cut a square piece of thin stainless steel to fit in to the front of the ice bucket between it and the ice crusher housing.  Basically, blocking the hole that the auger had created in the bucket.  The stainless steel was from the cover off of an old stainless steel wrapped microwave for an idea of how thin the sheet metal was.  Thin but, sturdy is the best description.  Once reassembled, everything worked smoothly but, it didn't take long for the drive cam cup to be damaged once again.  The alignment tab on the cup snapped off apparently when the slightest resistance was encountered.  However, this time with the stainless in place, the auger could not screw forward in the bucket and the cracked cam cup is staying in place with the ice dispenser working fine.

Update:  After listening to the ice maker get gradually worse in performance (grinding, thumping, etc.).  I decided to take another stab at fixing it since I already had another drive cup to replace the one that I installed and was damaged almost instantly.  Luckily, I believe I have found the root cause of the problems and corrected the situation in the process with a fairly simple solution.  As it turns out, the helix lock was slightly egged out allowing the helix to float free on the auger shaft towards the rear of the ice bin.  I believe this in turn allowed the helix auger to screw itself through the nylon nut and the front side of the ice bin.  In addition, this also allows the helix auger to turn to such a point that the ice maker drive in the rear of the fridge, cracks the drive cup easily.  The way to fix this correctly, is to merely replace the helix lock so that helix will not float free towards the rear of the ice bin.  However, since I did not have a new helix lock handy, I slipped the smallest stainless steel hose clamp I had available (see pic) on the auger shaft and secured it very tightly at point where the round shaft meets the oblong portion of the shaft, cheating it slightly towards the oblong side of the shaft to insure that the helix would stay securely in place on the shaft.  Once I installed the new drive cup and reinstalled all the ice bin components and reinstalled the ice bin to the fridge, the operation appears to be just like new once more.  Sound and functions are smooth.  No more thumping and bumping.  The drive cup is still undamaged and all appears to be doing well after a few days of use.  I will order a new helix lock only as an additional step to make the ice bin like new even though the hose clamp is holding the helix is the proper position which appears to have resolved all of the problems that existed.

Finally - One last post on this repair project.  I got a new helix lock and replaced that although the SS hose clamp had done the trick holding the helix in place preventing damage to the cam cup and making the entire ice dispensing smooth and flawless.  I have added a few pics showing the egged out helix lock which was replaced, the SS hose clamp installed, and the cam cup after a few weeks of use.  I have come to the conclusion that the cam cup sole purpose is to merely keep ice cubes from dropping out of the rear of the bin.  It has no other significant function since it too weak to be for anything else.  As long as the auger stays in place and the helix works as expected, the cup should never really be damaged.  I would suspect some other failure point, if you find that your cam cup is broken.  More than likely, the helix lock has failed allowing the auger to shift out of position and thus breaking the cup.