The shoulder offset is the distance from the center of the screw to the center of the arm attachment. The hub offset is from the central axis of the hub to the attachment of the other side of the arm. The is really no math savings in changing the geometry to eliminate them and it won't become like a Rostock. The shoulder rotation causes a translation and that has to be accounted for regardless of the offsets. You could make this have the Rostock math by adding traditional rails like a rostock and have a bearing pivot instead of a screw pivot for the shoulders.
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