I can't get this damn thing off. I need to get the pulley off just to get to the bolts that hold the pump on. I see a little allen-head inside and have tried using an allen wrench and a big bar for leverage, doesn't move an inch. Soaked the thing twice with WD-40, still nothing. All it's doing is breaking my tools, this thing WON'T come out. Am I doing the right thing or is there another way to get this pulley off?