Inclined Plane - A flat surface of any extent positioned somewhere between horizontal and vertical. The through-the-waist "Plane of Rotation" of the Clubshaft as established during Address Routine.
What is the significance of the second sentence and how or where is it used? Cannot the clubshaft at address be on a plane that does not run through the waist? I can see how it is distinguished from a "basic plane" since a plane line is not included in the definition but could also see this implied if the conditions are an example. Seems like a strange way to define the plane angle if that is the intent.
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