Thank you, damascus, for that post and picture. There have been times when a set like that would have been very handy.
For an update on the project............. I took an entirely different route than what I had planned. Turns out that the hole in the rib for the mid-bead was smaller than the front, which was 6-48. The mid-bead hole was actually threaded, and was 5-44. It was not too far off center, so I enlarged the hole with a Dremel burr, on one side, so as to center the hole on the rib. Then I drilled and tapped it for 6-48, ordered a tiny mid-bead with those threads, and screwed it in. Perfectly centered now, and impossible to tell that it was ever buggered up.
Thanks to everyone for the ideas and suggestions.
Best to all, SRH
