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Anyone experienced the negative air chamber loosing all pressure? After setting mine up last weekend and going back to it today, I found it was back to empty.
Will check to see how long it takes to drop again. But am assuming it's a repair at silverfish.
It's been a while but I think that's what happened with mine - was mojo at the time who were dealing with them IIRC and a service sorted it. It's obv a high pressure shock so emptying it over a week sounds like trouble at mill.
try nipping the valve core up with a schraeder valve core tool, the negative pressure valve is nothing fancy - its the positive valve that has the double depth screwy on job (technical term).
Mine leaks a little bit over time even after nipping it up.
Cheers rusty, will give it a go