Thread Size
Dave; Are they 1/4 - 24? That is the size of Springfield 1903 trigger gaurd to frame mounting threads. They are designated 1/4 - 24 NS (national special). I was able to buy the taps and dies on special order through Van Hornes Hardware in Fultonville NY to make a T handle set to inlet Springfield Sporters.
I have had a couple of out of register framescrews over the years and wonder how it happens. Perhaps the threaded mate was misaligned after frame recase. This is about the toughest Parker screw to move, and I can think of no reason for it to meander.
Best, Austin
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Threaded Mode