This is an sketch of what I was thinking: https://docs.google.com/drawings/pub?id=1MN5xA6wIUwZEShMNiRb31sHaXfqESVQ67kK6TPyDW2E&w=766&h=530 [img]https://docs.google.com/drawings/pub?id=1MN5xA6wIUwZEShMNiRb31sHaXfqESVQ67kK6TPyDW2E&w=766&h=530[/img]