i was tighning a one of the 10mm bolts on my crank pully and it broke off, i guess i realsed my vengence on it lol.. but yes how do i get the broken piece out? seems dangerous to have 5 out of 6 bolts in..

also i have a nut that is stuck in place like the threading on the screw is bent

all this bad luck.. please help!!
-chris