Originally Posted by
old's'cool
Given the circumstances described by the OP, most likely the 5.5 Allen would have acted like a dull reamer, and swaged the hole out to 6.35mm diameter.
Yeah, mine probably wasn't quite as stuck as the OP's. Also I'm guessing that pounding in the 5.5 also helped the PB Blaster I'd squirted in there work it's way into the crank threads as well. A little of this and a little of that.
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