Check Brownell's first. George is dead on that a call to their excellent tech support line may be all that is needed.
Do you know the size, type and number of threads you need? If you do or can find out, try contacting some tool and die companies to see if they have what you need. Vermont American comes to mind as I've used their taps and dies for over 20 years. Sorry, I really have no idea just how to get in touch with them. Try searching the web.
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Politically, Fashionably and Aerodynamically Incorrect!
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