Dave, still trying to figure out what "arc along the OB plane" actually means? Isn't an "arc" simply a portion of a circle when viewed from the top? Isn't the "OB plane" a line when viewed from the top? Is the illustration below close to what you're saying? If so, which arc (A, B, C, D, none of the above) do you pick? Or am I totally off?
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Looks to be between A/B. B is def the closest. This is a great picture of what I'm saying.
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