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Maybe you could drill out the old bolt and retap the tread, I know there is a hardened piece broke off in it now but with the right drill bit you can do it.
You can drill the spot welds out or use a hammer and chisel and split the 2 metals I think the hole saw should have worked maybe it was dull. The other thing is to use a self tapping sheet metal screw and just use a new hole.
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