Garry Dryden of Dryden Trailers (the 5th wheeler people) have come up with a unique solution that gives wonderful bottle security against damage. The system is very simple yet is easily the best we have ever come across. It positively stops the paint finish being damaged and therefore virtually eliminates damage from eventual rust. The over centre toggle action on the clamp is very easy to use and adjust if ever needed. The idea of using rubber insertion on the two edges is brilliant and the cylinders just never move.