Steering box sector shaft adjustment

1971 Demon 340 H car, power steering box, adjusting the sector shaft end play, after loosening the lock nut, which direction do you turn the center adjustment screw to take out play/slack in the wheel, clockwise or counter clockwise?

I've searched and read threads but no definite answer, but I read there is danger of over adjusting and having the screw come out, a definite bad day thing. I could just try but not up for disaster...

Thanks, LarryM