How much wear, on the tip of the valve, is too much (thus the valve should be replaced)? Most of mine are perfectly flat and smooth, but a couple have very slight imperfections on the tip. Keep 'em as is? Machine 'em flat? Replace with new?
I tried to take pictures but just couldn't make them come out. It looks like an area, maybe 1/3 the diameter of the tip, that looks slightly pitted and is a little rough. Big deal or no?
One other thing, these are "F2" valves with the black coating.
