Originally Posted by
Grim
Those have a similar design to Topeak that I have. I think you may have made a mistake cutting that part.
Those pumps can work on both Shrader and Presta but you have to reconfigure it. To do so you have to unscrew the cover pull out the rubber seal. under the rubber seal is a plastic piece that installed one way works on presta Fliping it over put a tab out that will press the valve in Shrader. I think you have the plastic peice in wrong.
I had thought so also, I was in the store ready to buy a new leyzne and saw that the PB pump I was about to replace did schrader and presta, and I wondered how it did that, so read the back of the package. Then I went back home and took it apart to make sure I had it in the right way. It was, but the plastic piece was in so deep that it wasn't connecting with the top of the schrader on certain valves.