I honestly don't remember the size screw I used, I just used the smallest one I had. I remember it being pretty close though.
I may use a dovetail mount at some point. Right now I have a over bore bipod, which I really like. If I could find a dovetail to pic rail that was as long as the one that is on the notos I would use it.
Before I shortened that screw it would be fine when I zeroed it (like it wouldn't shift as I was shooting), then it would be slightly off each time I filled it with air. I haven't done any shooting after fixing the screw so I'm not sure how it effected POI shifts.
I likely won't shoot much until my bottle conversion comes in, no sense in shooting if I will just have to adjust everything in a few days.