⬢Insert four M3n nuts into the holes on the backside of the X-end-motor.
Use the screw pulling technique.
⬢Insert and tighten the M3nS nut into the plastic part.
⬢Screw the M3x25 screw into the plastic part. Do not tighten the screw completely. Keep the screw head aligned with the top surface of the part.
⬢From the "bottom" side of the part, insert and tighten the M3x16 screw.
There is no thread in the plastic part, no nut. The screw cuts a thread into the plastic when tightened.
Make sure you are using the correct length of the screw M3x16, not M3x18. If you're not sure, always compare the dimensions of the screws with the cheatsheet.
⬢Insert and tighten one M3x16 screw from the "top" side of the part.