To begin, set up the counterbalance system by connecting a 0.75-inch-diameter PVC pipe. Insert one arm of the system through the holes in the cage lid. Place the second arm on top of the cage lid, and extend the third arm above and beyond the cage.
Finish by capping the top-most arm. After implanting the microdrive on the mouse goal, attach the microdrive to the counterbalance system using a counterbalance weight equal to the weight of the microdrive and bone screws. Secure a strong thread or fishing line from the electronic interface board to the counterbalance weight which hangs over the top-most arm.
Finally, ensure the counterbalance is firmly connected to the microdrive electronic interface board and that the mouse has full access to the cage.
