ok, i ordered my pure from webcyclery a few months ago, and now i need to replace the acs claw freewheel that came with it. the problem is, i have no clue how i'm going to remove it. the four 'teeth' things that you attatch the fw tool to have been ground down, apparently to save space between it and the bb shell. have any of you had a similar experience? if so, how am i going to remove this thing?