I had already considered that. At this stage in calibration, all 4 screws would be bottomed out, for the better or worse of the plan. First a 71.40mm chassis length was done, within the tolerances of my more crude dial caliper (instead of the Hass fixture). I was happy there. Right now I'm working on fashioning a ground glass to check lens infinity stop. But moving on, it seems to me mirror angle comes next. And the only way to zero in on that would be by screen squareness to the chassis assembly. Necessarily all one CAN do is bottom out the screen pegs and hoping for the best on that count, so you can shoot your mirror angle. Right? Then adjust your screen pegs last.
Originally Posted by lxdude