The dual point pendulum is a method to transfer pendulum weight precisely. In the drawing below the wheel is top heavy.
If you rotate the wheel 180 degrees, it will still be top heavy because each dual point pendulum transfers its weight between the two tie points. The dual point pendulum can be setup in many various different configurations. You can fix the weight to the center of the tie points, or allow the weight to move between the points.
Dual Point Pendulum Drawing
