I have an old metal flask with a real small opening, about 1/2" or so. These thing is full of Jack, and I had misplaced it some years ago. Just found it recently and the sugars in the bourbon have apparently crystalized and glued the metal lid on. I've tried vice grips, towels over the cap (which is metal also), hot water bath.

Any idea how I can get this thing unscrewed?

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