American Dynamics IP SpeedDome Ultra 8 Installation Manual page 14

Installing IP SDU8 with an Indoor Hardmount
14 Turn the eyeball assembly clockwise until you hear a click.
15 For ease of installation, adjust the two "swing out" mounting clips for ceiling thickness.
Using safety wire, attach the dome to a strong structural ceiling member as follows:
3-4
Figure 3-4 Aligning the Cap and Base tabs
Figure 3-5 Locking the eyeball assembly
Figure 3-6 Adjusting the mounting clips
Base Tab
Cap Tab
Installation Guide