The bit in the mill/drill press is a very good route of all else fails. Worst that can happen in that scenario is that you break the bit.
The challenge at times can be holding the frame good and tight in the right spot.
Other than what you have done, I cannot recommend anything different. Sometimes they pop free just when you think you are out of luck. And sometimes you just hope not to push it too far.
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B. Dudley
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