agitator was loose and not agitating

First I yanked off the agitator. Then I undid the bolt holding the coupler onto the center of the machine. Took the worn down coupler off, replaced it with the new coupler and bolt. Good as new. GE was going to charge me $85 just for a someone to walk through the door. After parts and labor I am sure they would have charged me $200. I did it on my own for $20 (had the part rush shipped so that was twice the price of the part).