I think they make a special pulley puller for that style of blower. I think it is similar to a 3 jaw puller that will allow the pulley to be held in place the bolt removed and then the pulley can be pulled with the puller. I have also seen that you can get the bolt undone with just hand hold on the belt below the pulley then use a 3 jaw puller to remove. Or others us a strap wrench around the pulley.