Hello, the washing machine we bought from the previous tenants of our new house seems to have a problem with the agitator. The columnar agitator isn't spinning. The bottom part is active and engaged, but it seems like the center part isnt attaching like it should. It isn't making any unusual noise and otherwise runs fine. When I push down on the agitator slightly it seems to lock and spins with the bottom, any help on how to fix this would be greatly appreciated. Thank you.

Ok, I popped the top of the agitator off and there appears to be no bolt for me to remove. Just a square hole with nothing in it. I can see the worn dogs around the outside, but I don't know how I can safely get to them. I'll upload some pictures later, they would probly explain what I see a lot better, since I have no idea what I'm looking at :D. Thanks in advance.