Can someone tell me how to remove a quick change upper pulley hub? The one on my truck now has 2 of the 4 screw holes jacked up, so only 2 screws holding on pulley. I have a new hub to replace it with but not sure how to remove it. Do I just leave the pulley attached and remove it as one unit? Because once the pulley is off the hub the removal tool can't reach the hub (too small diameter). Any help would be appreciated...