butlersrangers wrote on Oct 15^th, 2018 at 2:59pm:

Tis a beautiful thing when appropriate parts come together! It is fun how we all learn from such a project. As a point of interest, here is an 'approximate' contrast between "boomer's" replacement model 1892 butt-plate screw and a trap-door butt-plate screw. They are similar, but, a bit different.

Thanks for sharing that photo - it explains quite a bit.

At first I thought it fascinating that Springfield would go to the effort of making a new screw style for the Krag, but given a few more seconds I realized it was a new and thinner butt plate that they went to - and the screw change was necessitated by that decision.  A quick check shows the later Krag butt plate thickness is thicker than the early by about the thickness of the 'fillister'(???) on the later screw.  Possibly the initial butt plate change was an attempt to save $$'s?

I don't have a trap door, but I expect if we compared later Krag butt plate with a trap door butt plate, we'd find they are close to the same thickness.