Which companies do silver plating

I've used them several times. Any and all. Industrial chrome, or show chrome. all plating, gold, silver, oil rub bronze, Stainless, nickel. 323.363.7592

These guys did my Knuckle Heads

There is another place I had all my hydraulic cylinders chromed too.
Southern CA.  

there’s silver plating and there’s silver plating, esp wrt durability, difficult to know what you are going to get unless whoever it is has a proven track record for audio grade. Far better off to sell what u got and buy new silver.

WBT has silver plated speaker connectors.

 Checkout Bochinno audio or maybe he calls himself Boch audio I believe out of Germany. He can silver plate anything and is using some other exotic metallurgy practices.