I tried this and snapped the little cast retainer bit on the pulley bracket. I was using an allen key and turning the ratchet counter clockwise. I was in the process of swapping the air pump and belt and figured I would check the fan clutch because this looked easy but I think I messed it up. It doesn't spin as freely now as it did before I made the attempt. Is it possible I damaged it or am I just being paranoid?