After levelling re-anchor the fixture with a screw (5).
Use a levelling key to check the proper height of detent embedding to make sure that
the key is aligned with the mounting box edge and also touches the detent surface
(6).
Put the brackets to the left and right sides of the bottom detent handle (7A) and fit
their positions using screws (7B).
Now the mounting box installation is complete (8).
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