call up Topeak and act really angry about the fact that they saved 25 cents and left the mount that fits beside your water bottle out of the packaging. I have no idea why they only include the one that displaces a water bottle, it's sheer idiocy. If the angry act doesn't work, they'll sell you one for $5.

I don't think much of this pump, the head is too fragile and I wouldn't mount it near a wheel for fear the head would wind up in the spokes. It does a good job of pumping up tires though.