A plumber once told me, that before trying to undo a thread you first tighten 
it up, just a tiny bit. Don't ask me why, but it works.  Something to do with 
reversal of stress, I think. But now that you have rounded off the hexagon 
your best bet is, buy a new one.
Richard Pilfold
To win is nice, to race is enough.
Giancarlo Reggazoni
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