The instructions say:
Make sure the bracket bottom is at MAXIMUM 4.5 cm (1.77") from the bottom frame. It should be between 4 cm (1.57") and 4.5 cm (1.77"). Tighten the 2 bolts and make sure that the bracket is perfectly horizontal.
The Image given is
If this is the case then the threaded rod z mount at the top will not be in the correct position in future photos. The instructions say that the bottom of the motor bracket should be between 4-4.5cm from the bottom frame. The picture given shows the bottom of the bracket roughly 4cm above the top of the bottom frame.
Further chapters seem to have this piece lower… where does it go?