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Flatten out the exposed/busted bolt shank and drill a hole down the center ..then weld a nut on top.. sometimes drilling out the center weakens the grip of stuck or cross-threaded bolt.
Or you could just leave the cap bolted in place and use it as a template and go right up to the next bolt size ..as you're sure the threads are FUBAR'ed.
You shouldn't have any trouble drilling a grade 8 bolt..
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