John,

Was looking for hardware (shoulder thumb screws)to replace on a spoke
shave, and came across this site in PA. They say they do lost wax casting.
  
http://www.peerlesshardware.com/casting.htm  

 Don't know anything about them but hope it will help you get going.  Let
me know how you make out.  Got a couple of things I would like to get cast
some day.  That's when I getaroundtuit.

good Luck
Jim