You can try one of those screw extractors... but with a hardened bolt, I doubt you'll get anywhere.
I snapped the screw extractor inside the already snapped screw! ARRRRGHHHH!!!!
I took mine to a machine shop, and had them EDM it out. THis is a Star Wars type Electronic Discharge Machine (plasma cutter?) that literally vaporizes the bolt outt there! Was fairly expensive to do, but it did work.
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