I feel like such a noob. Erm that screw is circular I could probably use a vice grip but I would mess up the screw... Sorry for the stupid question but what is this two nut method. I'll do a quick google.
you don't, it was designed to be difficult to help prevent theft. A properly sized stud remover would do the trick with out damage. Or 2 stacked nuts tightened to each other, or vice gripes. It may have Loctite on the threads, may want to warm up with a heat gun.
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