IBM ThinkPad Dock User Manual page 36

3. Reinstall the bottom cover (1) and tighten the screw (2).
4. Turn the ThinkPad Dock right side up and attach the mechanical lock to
the security keyhole (see "Attaching a mechanical lock" on page 24).
ThinkPad Dock II
1. Turn the ThinkPad Dock II upside down. Loosen the screws (1) and remove
the bottom cover (2).
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ThinkPad Dock, ThinkPad Dock II: User's Guide