IBM ThinkPad Dock User Manual page 37

2. Set the PC Card lock to the locked position.
3. Reinstall the bottom cover (1) and tighten the screws (2).
4. Turn the ThinkPad Dock II right side up and attach the mechanical lock to
the security keyhole (see "Attaching a mechanical lock" on page 24).
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Chapter 2. Using the ThinkPad Dock or the ThinkPad Dock II