A modified version of the two-stage oscillator allows the pendulum to swing on a single pivot. This starts out with a slider, but the slider can be eliminated as long as there is sufficient force from the weight. This setup is simpler and more efficient.
A second method of getting over-unity is explained, where the pendulum is laid flat and spun at high speeds. This is a better method to achieve over-unity because a gravity powered pendulum moves too slowly, and the centrifugal force at low speeds is insignificant.
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