NEED a Hex truss rod screw for my bass neck

[lidesnowi]

Hi
Is there anyone here who know where to get hold on a Hex truss rod nut that fits the so i can adjust my neck without removing it from the body ?
I just can´t understand why using a slotted nut head here not the most ideal place to use a slotted nut since this type of rod require a lot more torque than a vintage rod :icon_scratch: :icon_scratch: :icon_scratch: :help: :help: :help: