I have this type of site on my old 1920's era 94 src . I'm trying to figure outa a way I can lock it into let's say the 300 yd setting mark . The way it is now it just a friction fit on the slide no detent or anything that holds it in place at what I set it at . Can anyone think of a way I can lock it into a setting without altering it from its original form ? If not I guess I'll have to get a lower front blade but there not easy to find either as it has a small bead on the top of it not just a plain blade