Lost power steering and thought that the belt had simply broken. Instead found that the belt had come off. In any event started the car again to a most annoying racket. Upon looking at the crank pulley assembly noticed that it was awry. Figured I would start by removing the belts and ordered a new set and the belt replacement sourcelet. Long and short of it is that the only one bolt was holding the assembly in place, one had broken the metal on the pulley but was I was still able to remove it, two of the bolts rattled out altogether, and finally two of the bolts regrettably have sheared off. The mounting plate seems secure, but has the two remaining bolts embedded in it. What is the best way to remove these, tap them out or whatever from plate? Obviously the pulley assembly needs to be replaced, but are there any other concerns here?