4-40 is a bit coarser, and if you start to feel the plastics, you can toss in a m3 since they're a bit bigger. My dislike about 4-40 is needing o use a 1/16 on flat and button head screws, buttons suck with the tiny hex wrench, where as m3 uses a 2mm which seems to survive a bit better.
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Andrew Burghgraef
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selling rf dex210 pivot blocks, pm me for details
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