IBM ThinkPad 390

Using Locks
Using the Security Screw
You can use the security screw shipped with your computer to
prevent the devices in the UltraBay FX from being removed easily.
To secure the UltraBay FX with the security screw, do as follows:
1. Power off the computer; then disconnect the AC Adapter and all
cables from the computer.
2. Turn the computer over.
3. Install the security screw and tighten it with a 2.5–mm allen
wrench.
4. Turn the computer back to its original position.
5. Connect the AC Adapter; then power on the computer.
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ThinkPad 390X User's Reference