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In all likelihood, the best option is to buy a replacement hose+pump head assembly. For Nashbar products they are relatively cheap. Typically cheaper pump heads aren't really servicable, but you can try taking it apart and putting it back together (but this is likely going to be more expensive than the 5 dollars for a new pump head+hose).


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Most likely a gasket/o-ring blew or some debris is caught up in the internals. I wouldn't use WD-40 as the light kerosene can deteriorate o-rings or some plastics. I'd try with some canned air / compressed air. If your pump head is well designed, you can take it apart and rub some silicone lube on the o-rings and mating surfaces to help restore the seal. ...


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One trick I have used in a pinch when my stem was too short for the rim depth (as your picture is showing) is to place my thumb against the tire at the point of the stem and carefully press in until the stem is being held out of the rim. This can give the leverage needed to attach the pump head to the short stem length. While the stem extender solution is a ...



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