Assemble the double bearing holder onto the X motor mount with 4x M3 x 12 SHCS and washers.
Leave the bearing holder loose at this point.
Install the Z switch adjustment screw, with spring and M3 Washer.
Install pulley onto motor shaft, verify one set screw is aligned with the flat on the motor shaft.
Install motor onto X motor mount using 4x M3 x 12 SHCS and M3 washers.
Take note of the alignment of the motor wires.