INSTALL RIGHT DRIVE ROD

Push the end of the coupler tube down onto the Motor shaft.

Adjust the height of the Z nut holder by spinning it to get it close in height to the X end idler.

Using 4x M3 x 12 SHCS and M3 Washers, attach the Z nut holder to the X end idler.

Install large zip ties on the end of the drive rod and on the motor shaft as shown.

The zip must be tight enough that you can't pull the drive rod off vertically.

Did you pull up on the drive rod to check the zip ties?