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Amo -- From what I read, it appears the threads are defunct. Unfortunately, the likelihood is that you are the victim of someone else's experimentation. At this juncture, I would suspect both the needle and the threads in the carb body. And I will bet even money that idle needle has been turned down too tightly somewhere along the way. Close inspection may even reveal a sort of a ring cut into the taper on the needle itself. A replacement needle is readily available for around $20 plus S&H -- Robert's Carb is a great source. Given the nature of this complaint, I strongly urge you to just decide to replace it without further thought. Now -- for the carb body. The thread pattern for the needles is almost assuredly 1/4-40, and such a tap can be ordered without too much looking around. I bought mine through a local tool & supply type store. The question then facing you -- do you do the repair yourself, or send it away for repair? This is not rocket science. Any machinist worth his daily salt could easily build the threaded area back and then re-tap the hole. The key is to do it squarely, and whereas the tap will likely follow the prior hole pattern, I don't believe this to be a great challenge either. One thing I would not do is go down into the hole a second time with the tap; once should do it. Then try the new needle. If you follow this pattern of recovery and -- in the days ahead -- resolve not to screw the needle down real tight, you should be okay for another half-dozen decades! You can learn more about carburetors in general by attending the following link, then select Carburetors.
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