Agitator wasn't turning while washing my cloths.

I just decided to tear into it knowing nothing about it. I really didn't want to pay a repair man $50.00 just to come look at it to tell me what was wrong. I first took the top part of the agitator off. Then there was a plug in it that seal it from getting water in to it. After I removed the plug I could see a 11mm nut holding the agitator on. I removed the whole agitator off and went on line to see what part I needed and what it was called. And the rest was history. I fixed it with no problem and saved myself probalby $100.00