The lower bracket needs to be removed to get to some components of the laptop.
Unscrew the 20 Phillips screws on the underside of the T42.
Unscrew the 2 Phillips screws on both sides of the T42's rear.
Flip the laptop over and open the screen.
Carefully maneuver the palm rest away from the keyboard, as both the keyboard and palm rest/trackpad will come off together.
The metal bracket will now be free to move, grasp it and remove it from the device.
Remove the small rubber piece that is covering the T42's microphone,