David,
I make the offset firing pins for early underlifters from "fatigue proof" steel rods I purchase from Brownells. In their catalog it is listed as "superior quality, high density, very machineable and tough, without brittleness, due to a high ratio of manganese to carbon. Does not require heat treating like low density mild steel-perfect for spring guides, screws, firing pins, any parts that will be subject to shock or repeated stress."
I just purchased a small thread cutting lathe and am still in the process of setting up a workshop. I'm not a trained machinist, but as I started making offset firing pins to keep my underlifters in the field, I'd like to try making hammer screws also, for the same reason. It's just going to take a while to get up to speed.
Dave
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