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tdmidget- I hadn't thought about the 'quality-of-heat-treatment' aspect before, but what you say does make some sense. If the pins were quick-and-dirty (forge) case-hardened or poorly quenched at some point, that could certainly make for a differential in end-for-end hardness and subsequent wear. (I keep forgetting how far materials science has come!) There is some evidence of cold-flow on one of the pins. . . . not so much on the other. Shame i don't have a hardness tester ready to hand. . . a series along the length of the pin would be enlightening and might answer the question of "intentional vs wear" quite nicely. i'm still trying to wrap my head around the near symmetry of the tapers given the disparity in wear in the rear vs the front. I have no idea if the assembly originally had shims; I'm guessing not, based on the wear patterns on the rest of the parts. Where can I get contact information for Mr. McCormick?
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