Finally managed to pull the final two idle mixture screws out of the carb bodies. Had to file the heads flat, center punch them, drill and easy out, along with generous amounts of lube and tapping. Unfortunately, no way to save them, so I’ve got to find a couple of replacements.
But at least they’re out, and I can go forward. Now I can break the carbs down more, and start searching for o-rings, seals, and such.
I’ll post up some pics tomorrow here, if anyone’s interested, maybe it’ll help them out.