Product review (3 stars): Works fine for me with slight alteration
I had to replace a broken drive cup on my GE icemaker. In researching the problem I discovered that the reason the drive cups break is because the aluminum auger shaft screws itself all the way through the refrigerator nut, shortening the effective length and causing the drive cup to break. It also causes the tip of the auger shaft to bore a hole through the inner bin wall at the front of the unit (see picture). Another reviewer of the drive cup posted a modification in which he drilled a hole through the nut and placed a bent nail in it to prevent the auger from screwing itself all the way through.  I made a similar modification in which I drilled a small hole through the nut in the grove for the retaining clip, took a ring shank nail and cut the head and the point off to that the length would be exactly the diameter of the nut at the retainer groove, and drove the nail in with a small nail punch (see pictures). I then placed the nut on the auger, replaced the broken drive cup and re-assembled the unit. So far is seems to be working fine.  Please note- I also cut about 3/16 inch off the end of the auger (about t threads on the threaded end) to accomodate for it not threading all the way flush to the end of the nut.