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SU Carb Needles

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I have a set of 4 screw and 3 screw, in reference to the Dome, SU Carbs. I prefer the 4 screw due to the ease of float access. The three screw has a nipple that makes it very difficult to remove the float safely without taking the carburetor apart. Other than that, they seem to be duplicates. I'm not sure if I should keep the 3 screw set. I can't see a time when I would them. Anyone interested?

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