I've a Giant Control Tower 2 from a few years ago. Supposed to be shrader and presta compatible and in fact there is an icon for both on the head but I cant seem to get it to work on a presta.
Yes, I've loosened the lock nut all the way and pressed it once etc, but when I press the pump head on to it and flip the leaver, its not opening the valve (no pressure registers on the dial and pumping just pressurizes the pump's cylinder/hose).
Works fine on shrader.
Is there something I'm missing....?
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