Sony VGN-FE890N - Manual (Page 106)

106 n N
Using Peripheral Devices
To slide out and secure the size adjuster
1 Use a coin or similar object (1) to unscrew the screw (2) on the bottom of the multi function bay docking station (3).
2 Adjust the position of the size adjuster (4) to match the size of your computer.
3 Tighten the screw on the bottom of the multi function bay docking station.