Originally Posted by
oneclick
That's the beginning of the method guys who can weld will use - put a nut over the end of the broken bolt, weld the end to the inside of the nut.
Yeah my thought (after the fact) was file the slot, then thread on the nut to stabilize the sides of the slot, then try to unscrew. I did see some of those welding ideas but figured my skills of JB weld, solder, etc wouldn't be up to the task.