Turn off the printer and center the extruder.
If you have applied tension to the belt, unscrew the belt tensioner on x_end_idler until the belt is relaxed.
Loosen the screws which secure the trapezoidal nuts. This is to ensure that the Trapezoidal nuts 'self-centre' on the lead screws.
Make sure the trapezoidal nuts are moving freely.
Alternate between all 4 screws evenly while tightening (alternate between both sides during the process). Don't apply any lateral force on the trapezoidal nuts.
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