Similar thing happened to my DR Summicron. It got dropped on a marble floor in one of Saddam's outlying HQ buildings near Fallujah, Iraq.
Focus froze and the mounting flange was bent.
Seeing as there was no Leica service there, I took the lens to the machine shop in our camp, stuck the mount in a vise and squeezed it back into round between two little shims of wood. Once the focus was working better, I got to the mounting flange and with some channel locks and a file, I got the lens back on the camera. RF was still working and I gauged it against a piece of tape on the film plane. Focus was still perfect.
Phil Forrest