A buddie of mine sent me this offline:
<font color="red"> I would have a prototype of what you need made up then look for someone with a screw machine.They can spit a thousand out in no time at all and let them supply the aluminum.Gary Alvey at G-G Machine comes to mind but his old website www.marksmanarms.com doesn't seem to be working.
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The
basics, starting out post states: i was using Gary Alvey in grand jct.,but he is out of the smith biz now.