Problem Solved, for me. My old pump was actually a MTB pump, with a thicker barrrel, therefore, the new Topeak wouldn't fit tight, even using the velcro strap. I simply glued small pieces of bar tape inside the clamp (WHY do I have two 5 inch pieces of old bar tape in my tool box?) and voila! Fits tight. And I still have two water bottles. The tolerances are very tight, but it appears it will work great. It's a little hard to see in the picture, but you will understand because WE'RE 50+ers!
