Yes at that point I would have been discouraged as well lol. I have also found that a small impact with air hammers makes a world of difference in seized bolts and related threaded components.
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Yeah... If I were to take a risk and try to remove it. I would take my Dremel tool and cut small slot in it. Then use my air chisel, or impact tool to see if I could get it to turn??
Gnarls.