This is what I was told years ago. The double headed screw right below the peep (which on your rifle looks like the right side is broken) obviously adjusts windage. The little screw just in front of the peep is a set screw that locks the elevation spring in place. The screw closest to the big elevation knob is the elevation zero set screw used to keep elevation from going below 100. On the left side of the sight base you will see lines for 100 200 300. I have never removed any of the screws completely.
You guys still around?
Pics on this thread seem to suggest the two smaller in-line screws -- between aperture and thumbscrew -- are opposite from what you've described above.
https://www.24hourcampfire.com/ubbt...8-bolt-peep-sight-questions#Post15256268Looks to me like the spring is captured by the forward-most screw -- i.e., the one closest to the thumbscrew. Which would make the rearmost screw the elevation zero set.
???
-Chris
I've made some progress, and I've actually adjusted my sight for elevation -- relatively easily as it turns out. I've been emailing with Bob Nisbet, too, and he's been very helpful!
My going-in situation was that the elevation knob wouldn't turn. In order to make it turn, I had to back off the little screw closest to the aperture, then depress the rear of the sight base (aperture end) and rotate the thumbwheel while still holding the sight base down. Afterwards, release downward pressure on the sight base, tighten that little screw, done.
I had actually "pre-treated" that little screw with a drop of Kroil first -- assuming 80+ years of non-use might have caused things to be a bit recalcitrant -- but as it turned out I'm not sure the Kroil was at all necessary.
In your first note, you said that "set screw locks the elevation spring in place." I think it locks the sight in that it prevents further downward sight movement once the thumbwheel is properly adjusted.... but it's apparently not the screw that controls the spring itself. The small screw closest to the thumbwheel holds the spring... which Bob says also passes through a hole in the bolt (for lateral stabilization) and actually rides on the firing pin. (???)
Bob's labels for those two screws are:
- El Zero Set (Optional) -- the screw closest to the thumbwheel (the screw that holds the spring)
- El Spring Screw -- the screw closest to the aperture holder (the screw that doesn't hold the spring, does lock the setting, and prevents elevation below 100)
-Chris