One of my valves would still need a huge initial pumping effort to start air going in despite breaking the seal first. A bit counter productive I know but try partially deflating the tyre first and see how you go from there.
@wvm started
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One of my valves would still need a huge initial pumping effort to start air going in despite breaking the seal first.
A bit counter productive I know but try partially deflating the tyre first and see how you go from there.