Hansgrohe Metris C 15404 1 Série Instructions De Montage / Mode D'emploi / Garantie page 10

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Measure the distance from the front of the
plaster shield to one of the screw-in flanges
("X").
Add ½" to this measurement.
Cut each screw so that it is X + ½" long.
Open the stops using a 4 mm Allen wrench.
Install the carrier plate.
Install the carrier plate screws.