5 hours ago
If I were too design that (I mean I woulbe told to use ball gear or be fired), I would machine a ball with a small pin at the end, drill a hole in the shaft (concave) and glued the pin in the hole. That would be unbreakable. Better yet, just drill two holes, in the shaft and in the ball, and use separate pin.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.