Howzit, looking for the pool pump diy'ers. Mine (the quality brand) has developed a leak from the bottom which I'm lead to believe is the mechanical seal. So I've disconnected it and split the pump from the housing. The problem im having is i cant seem to spin off the impeller even while holding the shaft (with screwdriver) at the fan end. The impeller just freewheels. Added a couple pics for clarity. Anyone dealt with this before who can offer some advice?