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What size is the set screw – Gas Diffusers 54A for Lincoln Magnum 300-400Amp and Tweco #3/#4 MIG Welding Guns

gas diffuser lincoln
Q What size is the set screw? I keep losing them and have about a dozen diffusers without the screw.
asked by G.L. on October 21, 2015
The ID of that little black screw is 2.20mm

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