4mm nut drivers and wrench
thingiverse
Some nut drivers with a 4mm hex for M2 nuts. The hex carries through the parts so the narrow end can be used in tight spots and the thicker end can be used where higher torque is desired. Either the short driver or long driver can be held in your 8mm prop tool. A bit of heat shrink on one of your other hex drivers makes a handy storage spot.
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