Martin Alien 05 User Manual page 28

1 Cut or drill a 45 - 50 mm (1.8 - 2 inch) hole in the ceiling surface.
2 Remove the snap ring from the end of the Arm using a pair of retaining ring
pliers. Slide the Arm through the hole on the bracket of the Alien 05 Stem
Mount head and replace the snap ring.
3 If you have attached a 600 mm long arm then attached the cable extension
that is supplied to the cable on the Alien 05 Stem Mount head.
28 Installing an Alien 05 Stem Mount