Ul...;
OK understood...so I guess you're talking about Item 19, Support Arm...which has no nut, but indeed threads into a captive threaded insert in the frame...and the massive torque applied to back out the rusted part of bolt, which was protruding through that thread was enough to lock the bolt in threads and shear it (this also tells me that WD, mostly useless anyway, but none of it was where it needed to be, lubing that threaded interface).
I can't recall immediately, but is there access to drill?...at this point, removal of the stub is going to be a major operation and pain...I can suggest that it might be easier to turn the stub in after heating it red hot with a gas torch to loosen rust in threads, then drilling or somehow getting something on it, with which to get it to turn, (really) applying a proper penetrant (also on threads from inside frame box), and trying to get it to move...none of which is news to you or your neighbor probably...
Good Hunting!
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