Rockwell Automation 6158 Industrial 21 inch CRT Monitors - Manual (Page 8)

8 Industrial 21" CRT Monitor
Publication 6158-5.0
5. Insert the monitor in the panel cutout from the front (Figure 2). Do
not damage the threaded mounting studs as you position the monitor.
Tip: It will be easier to install the monitor if you support it with a shelf
or other support adjusted to the appropriate height.
Figure 3
Generic Panel Mount Diagram