Product review (5 stars): Easy $3 for parts and 30 minutes to fix, instead of $400+ to replace the washing machine.
My Kenmore washer is getting old, and the agitator was getting noisier and seemed to be beating itself to death. The one day it just stopped moving altogether. The motor was running and it sounded like it was working, but nothing was actually moving. I researched online, and found a parts breakdown that showed these dogs. I took the cover off of the agitator and found that 2 of them had no teeth anymore.
I spent about $3.00 for these, and about 30 minutes total to replace them.
Almost a year later and the washer is still running perfectly.
This is a very easy problem to diagnose, and the replacement was almost just as easy.