Finally got around to installing my fuel bottles. This involved some big guesses to get it working. If you notice, there's some clearance inside the case between the mechanics of the expansion and the actual sides of the case. You can't screw anything through the vario portion and expect any strength. So the right side (larger) case was the only option. On the other side, the screws stuck out too far. I also used large washers where I could, just for extra strength, but after seeing how thick the plastic is, just a washer and lock nut (and blue lock tite) is probably sufficient. Before trimming: After trimming: Finished product, bottles mounted. I strapped bottle #2 to bottle #1 using creative strapping. The left side straps for bottle #2 strap to the right side of bottle #1, and the right side straps of bottle #2 strap through the footman loops across to the left side of bottle #1. Finished, mounted on bike, with the right case expanded: Case in shrunk form: Final note.. I'm going to place a piece or two of harder foam packing between the bottle holders and cases with double sided tape, that way they won't move up and down as much-- this happens by the nature of using webbing straps with footman loops, there's not much force preventing up and down movement, and there's about an inch to two inches of play.