Avaya 1100 Series Software User's Manual page 19

Setup and assembly
The Expansion Module is tightened by turning the wheel clockwise and loosened
by turning the wheel counter-clockwise.
Turn the wheel clockwise on the back right side (if viewed from the front)
of the Expansion Module to loosen the stand hinge. Adjust the angle of
the IP Deskphone using the tilt lever. When the IP Deskphone is set to a
preferred angle, turn the wheel counter-clockwise on the back of the
Expansion Module to tighten the stand hinge and lock the stand at the
same angle as the attached IP Deskphone.
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