I was trying to change the blade out in the planer and slipped trying to un-do one of the bolts... turns out I suck at reading directions, they turn the other way... I hate tricky bolts, I'm used to righty-tighty, Lefty-loosey...) I ended up punching the metal which happened to have a blade in it... the cut didn't actually hurt near as much as the punching of the metal...