All these systems (when it's not an hoax or an error of measure) use only basic physics law: take 2 objects in rotation (free rotation), when you apply a torque on an object, the same torque is apply to other objet in other direction, but with different inertia, each torque don't works at same value, inertia change the angle and the work from a torque is torque by angle.
You can verify with Algodoo or Comsol Multibody, sum of energy can be increase with a simple rotation with 2 objects.
With an axis it's works too but lower energy can be recover in 2D:

Red disk is free compare to blue object. CG2=center of gravity red disk. Red disk turn around itself, with its own moment of inertia, the torque apply to blue object can't change its rotational velocity due to its moment of inertia in the same manner. Sure, if no friction between 2 object, this don't works.







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