Thanks for the info guys! I think I'm going to stop at a local hardware supplier and see what I can find. I looked at the Gp pins and the M5 screw is drilled and tapped M3 for adjustment. If I can find both sizes I'll use my lathe to do the M3 threads.
Cantstopwontstop, I have 2 GUS Core G22s, and a Lord on the way. I'm really liking the feel of the button with the bearing in it. The build quality is top notch and the price is a bargain for what you get. I don't feel I have to pay an extra $100+ just to get a S/N on a mod. The other thing I like is that the GUS hasn't been cloned.
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