You can get anything you need right here www.pantherjet.com . It sounds like a keyway might have sheared off or something. Panthers are bad about cracking shafts if they are abused and the throttle kept pinned to the floor while wave jumping. They usually crack right around the bearing area I believe but I'm not a Panther expert. There are some guys here who have some good running Panther drivem boats that can probably help you out a little more.