Hella OWS Série Manuel Technique page 31

2.1.1 Permanent
Mounting with
Enclosed Rubber
Seals
(not possible with OWS 540)
29
Insert the M10 bolts into the
left and right anchoring
bridges of the bracket.
Press the rubber seal into the
mounting plate.
Guide the connecting cable
through the cable opening, put
the fastening bolts through the
drilled holes in the vehicle
roof, position on the device
and tighten the bolts.
After mounting, make sure the
beacons are in vertical
position.