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Every bike I've ever had, has had a seized swingarm bolt. I've banged on this thread before about it. When I go to buy a bike I take tools, and ask if I can loosen and spin the bolt, most look confused as to why and let me try, sometimes they are stuck anyways, and sometimes they know they are stuck and claim ignorance.
My current bike had the worst one, super long bolt through all the usual structures, but quite skinny, so really hard to drill it on centre. had to cut the swing arm into at least ten pieces though
Little bit of this and a little tap of that. Bloody hell. Nearly drilled the whole thing to get it free.