Q FIX Barrel Wrench
thingiverse
Q FIX barrel nut wrench. You will need 5mm brass rod cut to 25mm lengths. You will need to grind down each side of the rod to about 4.2mm to make each side of the rod flat and fit in the barrel nut slots. Hammer them in the holes and they can be adjusted to the exact length needed to reach the barrel nut.
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