A major gun collector once told me that he never sold any parts because "you never know when you might need them." He also told me that he tore down old typewriters as a good source for all sorts of small bolts, nuts, springs, etc. useful in gun repair. (By "major gun collector", I mean that when he said this to me, we were comfortably sitting in his free-standing outdoor concrete gun vault, surrounded by several hundred firearms.) I have never mined an old typewriter for small gun parts, but I guess it might work.
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