Low car diet
Join Date: Aug 2007
Location: Corvallis, OR, USA
Bikes: 2006 Windsor Dover w/105, 2007 GT Avalanche w/XT, 1995 Trek 820 setup for touring, 201? Yeah single-speed folder, 199? Huffy tandem.
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I have that pump (Actually it's the Dx version, which I think is just a little smaller). The head works for both Schraeder and Presta without modification.
On a Presta valve there are two nuts. On by the rim that just gets cinched down lightly to the rim (this nut is inconsequential for pumping). Then the little one on the tip. That one must be uncscrewed all the way (and some times depressed once to unstick it) before you put the pump on.
The pump has a lever near the head. You put the pump on the valve with the lever parallel to the pump, then flip it out (perpendicular) before pumping. Flip it back when you're done and pop the pump had off the valve.
Don't forget to screw down the end nut when you're done.
Edit: don't forget to remove the black cap on the end of the valve to get to the end nut!