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Text excerpt from page 21 (click to view)
Installation I Screwing the Faceplate on the Unit
If you want to fasten the faceplate to the main unit so that it does not fall off, screw in the provided screw (Ã¸4 Ã 16 mm) in the hole shown below.
Never insert the taptite screw (Ã¸4 Ã 16 mm) in any other screw hole than the one specified. If you screw it in another hole, it will contact and may cause damage to the mechanical parts inside the unit.