EricH, there is nothing in the rules that requires the Bridge to be supported by its center. As long as it is within whateverthenumberis degrees of horizontal and all robots touching it are fully supported by it, it counts for points.
Your "common definition" argument is invalid, because the word "Balanced" is explicitly defined:
Arena 2.25:
Quote:
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A Bridge will count as Balanced if it is within 5° of horizontal and all Robots touching it are fully supported by it
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No other test is necessary. By your "pass-through" logic, it would also be near-impossible to receive 1 CP for a having two opposing robots fully supported by the Coopertition Bridge. Make a force diagram for all Robots touching the bridge. I doubt you would say the normal force is provided by the pivot point of the bridge- you would always identify it as Normal Force from the point of contact.