The blade holder/stump jumper is not tight to the shaft. I can push up or pull down on it and there is a lot of play. The shaft itself isn't moving. I wonder if there is something like a washer or bushing that has broken off ? The blade holder nut is flush with the output shaft so it doesn't appear to be loose.

This is one of these "good deals" I found for $350.

Anybody have a parts breakdown. I can't find one yet.