Presta core non-sealing issue
My new aluminum valves that I am using for my road tubeless wheels are leaky.
i seem to have tightened the rubber “cone” suuficiently but I took the inner core out & put it back in a few times in the course of trying to get a blast of air to seat the bead on the rim.
so far, so good - I finally seem to have been successful with that but the Presta core is now stuck open.
Is is there a way to coax this sticky valve to close properly under pressure?