How the hell do I get this thing off!!! Im using a big breaker bar. I just cant get the pulley to stop from turning. I tried wedging something in there but I am afraid it will crack what its resting on. I have an impact gun but dont know how to use it right

anyone have any ideas.
p.s I cant get the impact gun to be strong enought. i tried adjusing it but I can still stop it with a good grip. Thnaks.
I got it........ I just dont have a puller till tomarrow!!!!
did you remove the tire and inner shield,then just remove the belt and put those claws on and there you go