[racerabbit]

easiest and best way to remove a broken bolt, especially in an aluminum case, is grab a nut the same size as the stud, grab your handy welder,and build up a weld on the end of the broken stud, slip the nut over the weld nib, and weld it into the nut. serves two purposes... puts lots of heat into the stud to loosen it up, and gives you something to turn. works every time.