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Join Date: Feb 2002
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You probably need to reverse some parts in the pump head to set the pump up for schrader or presta valves.
The picture below came from Topeak's website. It shows the three parts you need to worry about...a gray collar, a red plastic piece and a black rubber grommet.
Unscrew the collar. Lift up on the lock lever to push the grommet out. The plastic piece will either come out with the gommet or simply fall out after the grommet is removed.
The rubber grommet has a hole running through it. The hole is large in diameter at one end than the other. The larger end of the hole is for schrader valves. The narrower end is for prestas.
The red plastic piece has a distinct projection at one end. That projection is designed to depress the valve core on a schrader valve.
To set the pump up for shraders, put the nipple of the red piece into the narrow end of the grommet. Put the grommet into the pump head with the wide hole pointing out (ie. set to accept the valve). Screw the collar back on.
To set the pump up for prestas, the nipple on the red piece should face in, and the narrow end of the grommet should point out.
I'm not sure I'm explaining this clearly, but once you open up the pump head, it should be pretty self-evident.
Religion is a good thing for good people and a bad thing for bad people. --H. Richard Niebuhr