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Insert a thin nut m4 as shown above. Before doing that clean the hole out
a little and insert the nut.
Mount parts onto the extruder arm:
From right to left. M4x20 bolt, 2x small washer, bearing, small washer,
plastic part, thin nut.
Mount the extruder wheel onto the motor with the little set-screw from
the bag of the extruder wheel. The set-screw should not stick out more
then 0.5mm, because it might then scrape the surrounding plastic parts..
NOTE 1: sometimes the tolerances of the extruder wheel are tight. It is very
difficult to get it on the motor-axle. DO NOT force it on there, but try to
drill out the hole with a 5mm drill, until it fits smoothly on the motor-shaft.