Got it fixed

I just cut the pulley in half to get it off. The armature has a tapered and splined shaft holding it on. I think those tines are to keep you from pounding it too far down or give you an idea of where to stop pounding.

I don't think there is anything stuck between the inner and outer drums so I think the problem was just us filling it too full.

There isn't really much of a belt tensioner just some bent coat hanger wire thing.

If I hear the belt squeaking again I will replace it right away next time.