Ultimaker UM2 Assembly Manual page 37

1.
Screw the M3 socket screw
in the sleeve.
2. put the sleeve on the end
of the motor, with the screw
towards the end then screw
3.
this very firmly. Make sure
lever to each other, with the 8
that the top of the sleve and
mm the bearing in between
the axle are flush.
Press the two parts of the
37