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How to make hollow shaft
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Mysterioii:
I'm curious as to why you want a 2mm hole; you can get 5mm LEDs that are single color and 5mm LEDs that are RGB.  Or were you planning to use 3mm monochrome LEDs?  The whole LED doesn't need to fit through the shaft of course, just the wires, and they don't need to be particularly thick.  But to me, I'd just have the hole bored out to accommodate the 5mm LEDs then you can always change your mind later if you want to swap to RGB or stick with one color.
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