When the internal counterweight is shifted to the "out of balance" position, ask customer to grasp the handle firmly and spin the wheel. The vibration caused by the unbalanced condition will shake the customer's entire arm, simulating the shimmy one experiences while driving a car with unbalanced wheels.

Reset the counterweight to the balanced position, and spin the wheel again. Because it is now balanced, it will spin smoothly. After this simple but dramatic demonstration, even the most skeptical customer will understand the importance of wheel balancing.