Ithaca5E, the Lefever ball joint is way more than "something to play with". It works, and it works just about forever unless the frame cracks. I find it hard to believe that no one else ever picked it up. In more than 55 years of messing with Lefevers, I have bought one that needed the screw turned. It turned about five degrees to tighten the gun and will never need to be tightened again. If it were a hinge pin gun, it would have needed a talented gunsmith or a shade tree fix.