I agree with this entirely.
I wonder if the non-working parts of a camshaft have the same hardness? It would depend on the process used and perhaps that would be different from manufacture to manufacture. If the entire camshaft is case hardened and THEN it is ground, I would think testing in a non-ground area would indent slightly less than a ground working area, thus giving a higher rockwell. I'd like to just say "buy American" but I'm not sure that is valid anymore...
