Apple PowerBook (Duo 270C) - Manual (Page 246)

4. Disconnect the power supply cable by pinching its
release clip and pulling straight up.
If there is a hard disk drive in your Duo Dock, you may need
to move its ribbon cable aside to reach the clip on the power
supply cable.
5. Loosen the two screws connecting the central part of
the dock to the base. (In the rest of these instructions,
the central part of the dock is called the
subassembly.)
Turn the screws counterclockwise. The screws don’t come out
all the way, so you can’t remove them completely.
Screws
Pinch clip and then pull up.
230 Chapter 13: Building a PowerBook Duo System