Got quite confused when I was looking at the Z Axis instructions and it showed the nut below the pulley in the photo. At first I assumed I had made a mistake and took apart the drive rod, but then found I had assembled it the only way possible. Only later figured out that the M8 drive rod instructions have you install the nylock before the pully, but Acme rod has it after.
It’d be really nice if the Z Axis instructions had a choice that showed the correct configuration for both M8 and Acme drive rods (in addition to the existing choice of motor).