48Buick
I agree with most all that you posted except for the sandblasting to clean up old potmetal.
I have been working closely with a local plater for about 25 years and I always have him chemically strip my parts. It removes the old plating down to the copper and then I can hand finish from there to get the pits cleaned out.
Blasting can cause small bits of media to get embedded in the surface and screw up the plating.
I make a lot of new parts from ZA alloys never blast them before plating...
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