Install the rotor onto the studs over the spacer plate and secure it with lug nuts tightened to 90 ft-lbs. Now is the time to check the rotor for runout. Use a dial indicator as shown here. Ours checked out at less than 0.005-inch on each side so we were good to go. If the runout is excessive it can sometimes be adjusted by rotating the spacer and rotor to a different position. Mark the rotor and spacer with a punch or a dab of paint to keep them indexed during future servicing.