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dfletcher Member Posts: 8,154 ✭✭✭
What is the shank threading on aperture sights for Lyman, Redfield, Williams and Brownells made aperture peep sights? I know Marbles is different. Am interested in the Lyman types only.
Most Lyman and Redfield used a 7/32-40 thread aperture. Kind of a non-standard thread.
7/32-40 is #12-40 Taps are not common but available