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Somehow I have managed to jam the idle mixture screw in one of my carbs. Completely stuck and will not turn even though applying enough force to twist the screwdriver blade: can just get a small amount of back and forth motion before it locks up. I have tried a little heat to the carb body and penetrating oil.
Any ideas for removal?

Thanks for the helpful comments about this on my post on the wanted section asking for a spare carb.