I was figuring on adding springs to a hammer gun I have that didn't have them originally, but you'd have to machine in the spring 'well' shown in that diagram for there to be room. Wouldn't be that difficult to do but I don't plan to do it. I wonder if those 2-pc pins of Austins are maybe not original? I can't see any advantage in having them 2-pc unless it's because it would allow replacing just the pin part if it broke or wore.
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