[barn34]

All they really need to do is put a short piece of netting attached to the bottom of the bridge that is weighted down on the other side with a piece of steel or iron (anything that keeps it in place, basically). It's long enough to account for the bridge in any position and still keep the desired ball deterent barrier. If balls end up getting stuck in excess material now instead of the polycarb when the bridge is sitting naturally balanced, they would probably have to attach it to a roller of some kind that would retract the excess material without impacting the natural bridge balance. That would obviously be more difficult to tune without completely impacting the current bridge design...but it's an idea that could be implemented, in theory.