Inspect the extruder body as shown in the first photo. Temporarily inserting a screw as shown will help you visualize how the nut must be inserted into this slot. Remove the screw before inserting the nut!
Insert an M3 nut into the slot inside the extruder body cavity. Use a small screwdriver to push it into position as shown. Check the alignment of the nut by looking thorough the hole. It it is not properly aligned, wiggle it into position with the screwdriver.
Insert a second M3 nut in the extruder body as shown in the third photo.
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