(Seems to lost the top part to pump the tyres and struggling to remove the valve extender)
if you've loosened it then tighten it back on and use a very thin allen key to poke down inside and check the valve opens/closes alright. If you can jiggle the value up and down then it should pump up fine.
@Sumo started
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(Seems to lost the top part to pump the tyres and struggling to remove the valve extender)