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It's easiest to run a flat down the length of the entire 5mm shaft.
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The flat only needs to be deep enough for the grub screw to catch and not slip.
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When your pulleys are in place, be sure to loctite your grub screws.
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Add the drive stacks to the printed pieces along with another 20t pulley to lock the stack into place.
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Be sure to wire the micro switch as NC (Normally Closed). On most switches this means connecting wires to the outer two terminals on the switch, but you can check with a multimeter by making sure there is continuity at those pins when the switch is not pressed.
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Add a vertical line to the 20t pulleys in each stack so you can troubleshoot slipping grub screws easily.
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The assembly with the micro switch attaches to the right side of the frame.
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Be sure to run wiring through the channel and be careful to not damage it while tightening.
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Almost done!
Finish Line