Thanks, appreciate the thoughts.
PierceA - On board with the fabricated/modified mainscrew and collar/retainer theory, especially with the empty pocket where an internal mainscrew retaining collar would fit.
The style of the gusset on the dynamic jaw support was actually one of the features that I thought suggested Prentiss inspiration, pretty similar e.g. on the model 254 one post up. Good point on the Reed similarity too.
My 4-1/2 Ridge-Simplex has a single large flat head screw holding the collar, guessing the Desmond matches this.
2-screw Parker collar, that hits close to home, need one for a 107. Probably going to be a fabrication project.
PierceA - On board with the fabricated/modified mainscrew and collar/retainer theory, especially with the empty pocket where an internal mainscrew retaining collar would fit.
The style of the gusset on the dynamic jaw support was actually one of the features that I thought suggested Prentiss inspiration, pretty similar e.g. on the model 254 one post up. Good point on the Reed similarity too.
That taper and sharp cusp is exactly what caught my eye. In a few months of browsing an unhealthy portion of the big vise thread, also cannot recall seeing anything nearly matching.The meatball screw head not uncommon, Rock Island, early Reed's and Parker's come to mind and probably a few others. But the taper right after the meatball going into the vise, never seen anything like that.
The external collar underneath the cast "awning", also now strikes me as a part later fabricated to fit in that small space, more than an original design.Also the collar holding the screw, both Desmond Stephens and Parker used this, but neither had the cast in "collar" on top of the collar; that is quite unique. Also you stated this was a 4 1/2", Parkers had 1 screw holding the collar till you got to 6" or greater, and I do not recall what Desmond did, but this has 2 screws for a smaller 4 1/2".
My 4-1/2 Ridge-Simplex has a single large flat head screw holding the collar, guessing the Desmond matches this.
2-screw Parker collar, that hits close to home, need one for a 107. Probably going to be a fabrication project.


















