The Phasing Hub's operation is based on the Harmonic Drive principle. There are four primary components in each Phasing Hub: The Adjusting Ring, the Flexspline with teeth machined into its inside diameter, a Hub with the same number of teeth as the Flexspline cut into its outer diameter, and a Hub with two less teeth than the Flexspline cut into its outer diameter.

The bore of the Adjusting Ring is not round, but is ellipse-like in shape. The Flexspline, with internal teeth, is inserted into the bore of the Adjusting Ring. In this manner, the Flexspline is deflected slightly to conform to the ellipse-like shape of the Adjusting Ring. The two Hubs with external teeth then mate with the internal teeth of the Flexspline.

Under normal running conditions, there is no relative rotation of the elements, and the Phasing Hub functions as a rigid shaft coupling. However, when the Adjusting Ring is manually rotated, the assembly creates a 100:1 ratio allowing for static phase adjustments as the two Hubs with different numbers of teeth are walked around a common axis by the Flexspline. One complete rotation of the Adjusting Ring creates 3.6 degrees of phase change at the output. For micro adjustments, Candy provides a graduated scale on the Adjusting Ring, which lines up with a mark on the inner Hub. Each graduation of this scale represents 0.1 degrees of phase change on the output element.