Y-axis pulley too high

After moving our lulzbot mini, the y axis pulley at the back of the machine is now much too high. The bed is hitting the belt when it moves towards the back of the printer. We can see how to take the belt off but don’t see any instructions on lowering the pulley. Any help would be greatly appreciated.

The pulley is held onto the motor shaft with a 1.27 mm hex screw. You’ll see a small hole on the side of the pulley. Just loosen, adjust the pulley height and re tighten.