Step #1: PrevNext
Remove the top from the mouse and then remove the circuit board. Make note of the wire routing for re-assembly.
Step #2: PrevNext
Solder a wire to each of the leads on the motor.
Step #3: PrevNext
Solder one of the motor wires to the normally open contact of one of the mouse switches. I used the left mouse switch, but you could use any of the three. Just depends on how soon you want them to discover your modification. The left button would be most used. Solder the other wire to +5 V. I connected it to the connector coming from the PC.
Step #4: PrevNext
Re-assemble the circuit board and cord into the mouse. Make sure to route the motor wires so they will not interfere with the functioning of the mouse.
Step #5: PrevNext
Now you can mount the motor to the mouse body. I used a small tie wrap and tied it to a screw post.
Step #6: PrevNext
Re-assemble the mouse and test. Every time you push the mouse button the motor will run and shake the mouse.