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What about the surface finish of the disc that the piston leather runs against--
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The edge of the disc appears to be chrome plated. I worked on one that was rusted where the leather pad had been resting; I think that the tanning acid from the leather had attacked the chrome. The leather needs a little oil on it but this one had dried out.
Used a carbide bit as Don described to smooth it out, but now the chrome is gone.