Product review (5 stars): cheap DIY replacement parts!
I had a washer that started to have the common slipping agigator problem; the agitator is supposed to have a racheting effect where it spins in one direction as the washer motor does is short quarter turn or whatever back and forth movements. When the agitator spun the direction its not supposed to spin, it was having difficulty holding the top part of the agigator in place and was making grinding noises sounding like whatever was going on inside was trying to do its job but couldn't. As it turns out, these tiny @$3 plastic arms were the culprit. Its common for the teeth on them to wear out over time, and that's exactly what happened to the original ones in our Sears washer after @20 years of use. I saw a video of someone repairing a washer with the same exact problem using the exact same parts and it turned out to be a super easy fix. Easily saved myself at least $100 than if I had called a repair service.

Chances are good if you have an old washer with the agitator problem I described, the agitator dogs are worn out. The dogs that came in this pack where identical to the 20 year old ones I pulled out of our washer.