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All distributors I can think of had the vacuum advance halves plated before they were crimped together with the rubber diaphragm inside. How you can replate it seems impossible to me so I have always obtained NOS ones when restoring distributors.





There's a lot of new masking agents and "plugs" available in the plating and powder coating industry today, even "wetting agents" so that non conductive items can be plated, or powdercoated...you can even powdercoat glass nowadays

Everything falls under "where there's a will, there's a way, how much do you want to pay"...