EXFO FTB-500 (Window XP) - Manual (Page 34)

Getting Started with Your FTB-500
24 FTB-500
Inserting and Removing Test Modules
7. While applying slight pressure to the module, turn the retaining screw
clockwise until it is tightened.
This will secure the module into its “seated” position.
Turn retaining screw knob
clockwise
FTB-500 left panel