Kutter smile thanks I will continue to noodle and I hope you do also.

gunmaker, are you saying that you think Tom's design use an over center concept or an original design of your own? If you had Tom's design in mind can you explain your thoughts?

I have been thinking this:
There is one possibility of design I was thinking about before Kutter offered his concept suggestion and that is to drill a hole perpendicular to the pivot pin in the base parallel to the sight blade or basically along side it. Into this hole a spring and detent pin would be insert. Then a small dimple hole would be drilled in the appropriate location on the pivot pin such that when the pin is insert the detent pin would fall into the detent hole in the pin preventing it from coming out and also turning. Disassembly would be a tap on the pin with a punch compressing the detent pin and spring there by sliding out. I will draw it up. Do you think it will work?