AT&T MERLIN MAIL System Programming And Maintenance Manual page 51

Installation
Figure 2-4. Mounting the MERLIN MAIL—ML Unit
6. Tighten the captive retaining screw in the mounting hole on the
cabinet's rear panel to secure the MERLIN MAIL—ML cabinet to the
wall mount and cable manager bracket.
.
Installing the MERLIN MAIL—ML Unit
2-9