This is the Wii track ball You will need a few items to do this mod a track ball assembly, an 11 pin .5 mm FPC clasp some wire soldering gun and solder. We will install a track ball on a wii mote for enhanced gamming..
here is the pin out for the track ball
(https://www.acidmods.com/RAND/12g2A3.tmp.jpg)
Step one lightly sand down the traces so you are able to solder to them.. Here is an ilistration of the wiring lay out of the Wii-Mote..
(https://www.acidmods.com/images/wiitrackball/wiimote1.png)
Step two solder wires to the point shown in the picture. notice I soldered 3 grounds to one spot this will become aparent later..
(https://www.acidmods.com/images/wiitrackball/wiimote2.png)
Here is the corosponding points for soldering the trackball to the wii-mote
(https://www.acidmods.com/images/wiitrackball/trackball1.png)
This is what your wii-mote track ball should look like when finished..
(https://www.acidmods.com/images/wiitrackball/Wiitrackball1.png)
(https://www.acidmods.com/images/wiitrackball/Wiitrackball2.png)