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Get a hand held impact wrench that you hit a hammer. Not sure but Sears may have these or try Post tools. I think they are about $15 and you need a 1/2" drive socket style Allen to go with it.
If you end up striping it out, it you will have to drill out the head.
I think the Might spray some PB on the opposite side of the Allen bolt from the head and let it set. If you apply heat, do so on the back side, not near the rubber boot.
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