IBM ThinkPad Dock User Manual page 34

2. Set the bay device lock to the locked position.
3. Reinstall the bottom cover (1) and tighten the screws (2).
4. Turn the docking station right side up, and attach a mechanical lock to the
security keyhole (refer to "Attaching a mechanical lock" on page 24).
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ThinkPad Dock, ThinkPad Dock II: User's Guide