I am trying to replace my water pump, but I've run into a problem. I've removed both the power steering pump/bracket, alternator (replacing with 1 wire), and fan+shroud, but how do I disconnect the hub which is attached to the front of the water pump and drives the power steering belt? The only visible thing is a sunken nut in the middle, but I don't see any way to grip it. Please help, every minute spent working on the car is less time driving it, thanks!