Others prolly have a better solution, but I have just hit the epoxy with a razor blade until I am through it and the threads. I have a fear of the dremel digging in an gouging the blank. After guide and most of threa i off, I use the razor blade to remove the residual epoxy above and below where the thread wrapping was, then AAAA steel wool or very fine scotch pad, so as not to go through the blank's original finish. Sometimes I do that though.
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