In my very limited experience of 3 or 4 examples, I do not think the screw that you show in Post #5 is the correct screw for a M1917 or P14 front band. The ones on hand here have larger bodies, than the reduced diameter threaded ends. And, to boot, it is my impression that those will be a BA thread - carry over from dragging Britishicon tooling over to USAicon to build the things. From what I am seeing, my guess is someone "forced" a normal USA screw into that front band.