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Just to reinforce what yorkie said, those screws are there to assemble the carbs in a controlled factory environment, not for taking them apart. We all know its tempting, but the chances of getting that butterfly back in the same position is zero, meaning that even if you can free the shaft, the carb will never be right from that point on.

Your best chance is a thorough cleaning, gentle heat, and working back and forth. If that doesn't fix the problem, then another, uncorroded carb is the safest solution.

The trouble with the "the carb is defective, I've got nothing to lose, I might as well take it apart and see if I can fix it" logic is that upon reassembly those screws have a good chance of working loose and being swallowed by the engine, turning a small problem into a much larger problem.
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