We had a crash today that broke the shank of a MT4 live center. I was hoping to get some help figuring out what happened. It appears that the live center loosened up and was hanging out of the tailstock when the drill came in and smacked it. I just can't figure out how the live center could have loosened up. We've made probably thousands of parts since this center was put in the machine. There's a bolt used to eject the center from the Morse taper. I thought it might have loosened up and pushed the center out, but it's tight. The machine has been holding close tolerances without issue. If the center was even a little loose, I would have expected sizes to be moving around. I'm stumped on this one. Pics are below.