EXFO FTB-2 - Manual (Page 42)

Getting Started with Your Unit
32 FTB-2 and FTB-2 Pro
Inserting and Removing Test Modules
10. Turn the screw clockwise until it makes contact with the faceplate of
the module.
11. Repeat steps 9 and 10 with the three remaining screws.
When you turn on the unit, the startup sequence will automatically detect
the module.
Turn locking screw
clockwise