Sorry, I wasnt clear. This about horizontal adjustment. At first, I tried to adjust the big screw to get infinity aligned. I didn't succeed. No matter how much I turn it, the second image is always on the far right of the first image (with the lens focus at infinity). So, I just try to push the arm using my finger, instead of using the lens, I found even I push it all the way down, the second image is still on the right.
Originally Posted by Rob-F
If it's the screw I think you mean, it has nothing to do with centering the rangefinder. It is the horizontal adjustment for the rangefinder. I don't know what you mean by "rangefinder patch vs. "center patch." To me, they are the same. How does it look with a lens in place, and the lens set at infinity?