I had one of the screws break off on my throttle shaft. One thing you can try...if you can get the shaft in a real good work holder on a drill press, and use a tiny bit, you may be able to drill out the brass screws without even touching the threads.
I tried it but went a little too fast and the drill deflected, so it did hit the threads. I wound up just swapping out my throttle shaft, but I'll still probably drill it out for #4 screws when I rebuild the K321 that I borrowed from.
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