When is it time for a new Vokey Wedge??

Fred; I'm not sure what you mean by "hard chrome"? I worked in a chrome plating shop for several years, and in the electroplating process, a piece or part must be nickel plated before it can be chrome plated. Chrome plating is just a clear coating that brings out the shine in the nickel.  

I dread having to replace wedges because I get so attached to them.  And the new one never quite feels the same as the one it replaced.  I probably have about 12 Vokeys sitting in my club closet of all degrees & bounces.  Most I've just played till they were worn out.  Wish there was a way to get them back in action, but at some point they've just run their lifespan.