I did my best to find that info Doc. I think it's lost in the shuffle... I wound up getting non-piloted adjustable reamers from an online site and lining them up in my drill press. But I was less than happy with that setup. It worked ok, but I still want to find a better method.
I agree. the one offered by the usuals is rather pricey and only works for the oversized shafts. My goal was to replace the bushings with new, and use a new standard diameter shaft.
A way around the wole mess is to use an old carb rebuilders trick. Drill or ream out the old bushings very carefully so the new bushings fit in the holes by hand. mix up a tiny bit of JB weld and spread it on the outside of the new bushings then set them in place. Lube the new throttle shaft with petrolium jelly, and slide it through the bushings while the JB weld is curing, making sure it moves freely
I've saved a carb or two with that trick. It's not the prim and proper way, but it works.