RE: Removal of a broken bolt ?
A bolt extractor set.
First you drill a small hole into the bolt (depending on the size of it) then the bolt extractor is a tpered, or cone shaped drill bit basically, but with the threads going in the opisite direction. So as you turn it into the hole you drilled in the bolt, (but counterclockwise) it tightens into the bolt, wedging and "grabbing it harder, and you are spinning it counterclockwise though, so it turns the bolt out!
Pray it real good with PB blaster or similar first to try and break the corrosion.
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