MM-style trussrod adjust on a homebrew?

[fish man]

For my project I really really want to have the trussrod adjust wheel like on the new Stingrays. I saw one just today on paintandsk8's homemade fretless jazz in another thread and I'm wondering whether it is possible to buy such a trussrod. Now I may be getting something fundamentally wrong about the design, because I've never dealt with trussrods before (outside of an instrument obviously), but as I understand it the wheel is threaded on in the place of an allen nut. Is that right? Where could I get that type of thing?

[Trevorus]

www.stew-mac.com

[fish man]

cool cool
thanks

That's somewhat surprising, I thought since no other manufacturers used that design that EBMM had somehow patented it. I guess it would be fairly hard to secure a patent on that, but in that case why don't other companies use that idea??