Manual steering box question

The factory manual says there is a high spot in the center of travel. You adjust the pre load until there is no lash then turn the wheel 1/4 turn away from center. Then using a torque wrench at the steering wheel nut, turn the wheel through the high spot and measure the turning force. I'm not sure about all gearboxes, but mine is specified to be between 8 1/4 inch lbs to 11 1/4.