Any way to "de-power" a power steering box?

I might add that I recall reading that ideally you should adjust the play out of the input shaft first before adjusting the output (sector) shaft. It is a little harder since tricky to unload the big steel lock nut and screw in the aluminum cap.

When adjusting the sector shaft, jack up the frame so the wheels hang and keep testing the steering going thru "straight ahead" since that is where the shaft should be tightest, and don't over-tighten it.