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A cable tie works well in many situations. Wrap it around the piece you need to undo and then pull the end so as to undo the stuck thread. The harder you pull the tighter the cable tie grips. You actually need to reverse the cable tie so it doesnt lock and you can just slip it off when you get the thing undone. I have carried a cable tie in my camera bag for 20 years to loosen stuck front filters.
Cheers
John B
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