"The Modern Gunsmith, Two Volumes in One -Volume II, Chapter XX, p. 274" (illustration) by James V. Howe ISBN: 0-517-38583X
..it's a neat project.
I installed a great folding leaf sight on my own Jaeger back in the last century, but I got rid of the folding leaf - too slow to use in hunting situations. I learned how to hold with just the non-adjustable leaf for ranges to 200 yards. (.60 cal, 86 gr. FFg. .022" denim patch with mink oil) This rifle has won several long range round ball matches out to 275 yds. and taken many heads of game including deer, bear, and moose. You don't need the folding leaf, perhaps.