Make sure you have totally removed the filament from the extruder_body.
Slide an extruder spring on a M3x40 screw.
Close the extruder_idler door.
Slide the screw with the extruder spring in the extruder_body.
Tighten the screw in the extruder_idler until the head is flush with the surface of the body.
If you have trouble closing the extruder_idler, try rotating the Bondtech idler gear with your finger.
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