do you mean the nut is spinning on the thread?? not undoing?? or do you mean the thread is spinning whilst trying to undo the nut? or heaven forbid, both??
if its spinning on the thread, then you can use a screwdriver or similar to put pressure on the nut whilst you turn it, tricky, but doable.
If the thread is turning whilst you are trying to undo, then you are best cutting the bolts down and drilling the threads.
If its both, cut the thread down, then hold the nut with pliers then drill the thread.
It'll be fun!!
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