I have a 1991 Giant Iguana with Shimano HG-22 (mf-tz20) on the rear wheel. When I spin the rear wheel with it up in the air and watch where the hub? comes through the freewheel I see what appears is a decent amount of up and down movement at the freewheel bearing?. The quick release is tight. I also can grab my rear wheel without spinning it and there is a decent amount of side to side movement. I am considering putting a new freewheel on the back and I am wanting to know if this will fix the problem or if it is the hub that is shot. Thanks for the info ahead of time. god bless