AMX MST-1001 Installation & Hardware Reference Manual page 27

Locking Tab screw (x4) - tighten to extend
MSD-1001-L Backbox - Locking tab and locking tab screws (X4)
FIG. 21
Locking Tab screw (x2) - tighten to extend
MSD-701-L Backbox - Locking tab and locking tab screws (X2)
FIG. 22
Locking Tab screw (x2) - tighten to extend
MSD-431-L Backbox - Locking tab and locking tab screws (X2)
FIG. 23
CAUTION:
Excessive torque on the tab screws can strip out the locking tabs or damage the Backbox.
Extend the Locking Tabs only AFTER the Backbox is inserted into the wall.

When installing the Backbox, make sure that it is positioned correctly.

Modero S Series Touch Panels - Installation & Hardware Reference Manual
10.1" Wall Mount Backbox
each of the four Locking Tabs
(max torque = 5 IN-LB)
Locking Tab (x4)
7" Wall Mount Backbox
each of the four Locking Tabs
(max torque = 5 IN-LB)
Locking Tab (x2)
4.3" Wall Mount Backbox
each of the four Locking Tabs
(max torque = 5 IN-LB)
Locking Tab (x2)
The maximum recommended torque to screw in the locking tabs on the plastic Backbox is 5 IN-LB [56 N-CM].
Installing Wall-Mount (MXD) Panels
27