Brickcom OSD-040 36x Series - Manual (Page 13)

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4) Apply lubricant to the Dome cover’s water-proof rubber to make the
installation process smoother.
NOTE - The tiny protrusion on the dome cover must align with
one of the four holes on the dome body.
5) Attach the Dome cover to the Dome body by gently pressing down
on the sides of the Dome cover with both hands.
NOTE - DO NOT press the cover from the top as this may
cause damage to the Dome body.
6) Screw the Dome cover and body together.