The CenterPoint that came with my NPSS has 2 screws in the windage & elevation knob, so how can you loosen them and rotate the knob to zero? I would understand how it would work if it had 1 screw in the center. Well it may not matter as mine failed over the weekend and it was shipped back to Crossman today. The problem I ran into was the AO as it kept climbing. The focus was OK at first but it started to climb, 10 yards went to 30 and so on. Over the weekend the focus for 50 yards was at infinity and it was still a little out of focus. Now I will wait to see what the ship me!