Originally Posted by
arborohs
Wow, this is some bad advice. It will oblong the hole in the crankarms. Only do this if you don't want to use the crankarms again.
This advice comes under
'removal of cranks with damaged threads ' on the park tools website with a warning about ruining the arm. Yesturday I removed some cheap cranks with a damaged thread using a hammer. Not recomended but it felt good to get the crappy part off and left the crank hole sqaure