IAI America FS - Manual (Page 64)

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8) Detach the motor cover.
(Use a hexagon wrench with the distance to the opposite side of 2.5mm.)
9) Detach the motor.
(Use a hexagon wrench with the distance to the opposite side of 2mm.)
Check the position of the alignment marks before taking off the motor.
Check the position (angle) of
the alignment marks.