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Hot tighten the Hemera nozzle to 3Nm at 285°C. Follow the official instructions from E3D here (step 18): https://e3d-online.dozuki.com/Guide/02+-...
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Let the extruder cool down.
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Place a sheet of paper on the heated bed. Manually lower the X axis until the Hemera nozzle is touching the paper.
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Make sure the X axis is flat (you can slowly move the Hemera left and right).
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Loosen the PINDA locking screw and place an object of 1mm thickness under the Pinda (like the middle section of a zip tie).
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Gently move the PINDA down until it is touching the zip tie.
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Tighten the PINDA locking screw to secure it in place.
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Use a plier if it is hard to reach the probe with your fingers during adjustment.
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Plugin and turn on the printer.
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Using the screen menu, move the X axis up until it crashes in to the Z tops. The stepper motors will skip. making a noise - this will not damage the motors.
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Using the screen menu, move the X axis down until the nozzle is approximately 10mm from the heated bed.
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If you have applied tension to the belt, unscrew the belt tensioner on x_end_idler until the belt is relaxed.
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Loosen the screws which secure the trapezoidal nuts. This is to ensure that the Trapezoidal nuts 'self-centre' on the lead screws.
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Make sure the trapezoidal nuts are moving freely.
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Tighten the 4 screws alternately (on both sides). Don't apply any lateral force on the trapezoidal nuts.
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Move the X axis to the middle of the Z axis and shutdown the printer.
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Tighten the belt until the belt is straight and doesn't sag. Don't tighten too much, you should still be able to pinch the belt with very little force force.
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Loosen the two pulley set screws a little.
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Adjust position of the pulley to have the belt centred. You can move the extruder by hand, to the left and right, to verify that the belt is centred.
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Tighten the set screws alternately.
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Verify that the belt is not touching the x_end_motor and that the drive pulley is not touching the X motor.
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