Ken, I drew up a design that I believe will work and incorporates all the original Burgess attributes, your input on the reason for the set screw, and a wider blade which makes manufacturing easier with the tooling I have available. Currently the design would retain the pivot pin as a press fit or a taper pin which I would want to be a little more positive so I will continue to refine. The basic dimensions of the sight are in the design however they will be refined as the project moves forward. The detent spring would be formed thru testing iteration when final piece parts are available.
The intention of the rifle is a both a retracted front and rear single folded leaf rear sight with a mounted Red Dot type sight mounted over the rear sight. Here are a few screen snap shots of the CAD model of the front sight.
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]
[Linked Image from i.imgur.com]