^^^ correct, for clarification, with the turret cap off the zero stop is exposed. It must be loosened before you can adjust, then retightened to hold the zero position (for zero stop). That small screw is prone to stripping if cranked down too hard. Like you, I twist the zero stop to the bottom, then back it out a bit to allow for .5 mil travel beyond zero. Last step is to replace the Turret cap on zero and tighten.