while I have the engine out I'm rebuilding the z-bar parts . I don't have a clue how to get the z-bar seal onto the ball for the frame rail side of z-bar. the ball appears to be pressed onto the bracket . I Could not budge the ball to turn it off. the opening is pretty small on the rubber seal and don't how to get it over the ball without sliceing it so I can slide it over the ballshaft. What am I missing there?