50% useless, 50% ok. Well I'm glad I tested it at home and didn't trust it on the trip. It works well on thick valves, but not at all on thin valves. I followed the instructions exactly, also I have been riding mntn bikes for over 20 years, I have a lot of experience with pumps. I've tried using it on a thin valve, swapped out the components as directed and it just doesn't grip or hold the valve. Extending the lever does not work. There is no support for the valve, it just falls out of the pump, and there's no point in trying to use the pump because. the pumped air is not retained, it simply escapes.
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