Screen Innovations Zero-G Owner's Manual page 48

RAISING THE VIEWING AREA
ZERO-G
THUMB SCREW MUST BE FIRMLY TIGHTENED TO PREVENT
THE DROP SETTING FROM CHANGING.
4
Make sure the wing cables both have tension on them.Tighten
the thumb screw firmly to secure the wing drop setting.
Perform steps 2 through 4 on both ends of the screen.
42
To reset lower limit turn to page
48