I really like that one Dan. Would you mind if I copied it? For my own use.
Heck I probably copied it from something I have seen at some time anyway. They came round or any other shape the shooter or maker though looked good.
I have to mat finish the "eyecup". Lay a piece of 220 or 150 wet or dry on it grit down and tap with a light hammer moving the paper around as needed.
The screw has to be shortened a little and the unmatted surfaces polished and blued. Probably use Brownells cold blue. Want to leave the staff hard.
Its an 8-56 thread staff. Its casehardened cold rolled rod. The "eyecup" is 3/32" 1018 flatstock. Slot was cut in the staff and then crushed in a smooth jawed vise to make a tight fit then filed smooth again.
Lock screw is a 5-40 just because I had one in a drawer.
Windage can be put in an eyecup with a dovetailed slide as well with or without tiny lock screws. I have seen this on old ML rifles and 19th century SS sights as well. Put windage in the eyecup because its on my swivel breech.
Tap the hole then use a split die expanded to make the threaded staff snug in the hole.
I made one with a 1/4 80 thread and a "lock" that is another piece a steel under the tang tapped at the same time as the tang but spaced away from it about .030. Its about 1/16 or 3/32 thick and is secured by a screw from the bottom at one end that allows it to move. A screw tapped into it from the top binds the staff when its tighted. The 80 thread gives very fine adjustments with the 40" barrel. But it was intended as a dedicated target rifle. Which I should have kept for myself it turns out since it shoots to good to belong to someone I shoot against.
Here it is helping to win a turkey match.
All the windage in this is in the front sight it has a pointer and scribe lines on the barrel.
Ned Roberts "Muzzleloading Caplock Rifle" is a place to look for ideas as well.
I use these to sharpen the barrel sights and they work very well but are not so good for hunting if the light gets low. Larger hole is required. This one is 1/16. Hunting needs something nearer .100"
In low light a larger 1/2" minimum cup is better than a "ghost ring" which can't be found in low light.
I need to go shoot it before the temperature hits 90 or 100.
Dan