Not too sure of the pricing yet, but I am looking into having tungsten carbide sprayed and then ground to size on a set I have spare.
here is a link to them
http://www.flamespraydenver.com/Processes.aspx, they are in denver colorado.
Having seen some of the materials they can spray, and having worked with some of the parts they can produce....I was VERY impressed.
For about 4 years I worked at a machine shop that about 1-2 times a year they would rent our King VTL. That machine shop had the only VTL large enough, and could go at under 1rpm without chatter so they could grind some specialty parts.
Nice lathe, but still used vacuum tubes....
I have seen shafts that tungsten carbide sprayed then ground to size from their shop....
A suitable finish for a seal, and a nice blackish color. Would go well with my bike.
Hoping the bill will not be sky high though, with shipping and all.
l8r