I bet its happened to a lot of us, at least once, spinning the removal tool thinking everything is hunky dorry and then seeing that it is in fact just shaving the threads.
Well, it happened to me at least, some time ago, and I just used another crank to replace it after I go it off with a steering wheel remover. Now i am putting together a fastish utility bike and was thinking about using that crankset. Its ok exept for the threads.
Do you just trash them? is there a trick to make them removable again for service?