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I tightened them up with an adjustable spanner when I first fitted them (after trying to use my lezyne screw on pump with them). Since then I've pumped them up a few times with a non screw type pump but whilst removing it to pop a new tube in after the puncture, I unscrewed the little valve cap and the core came out with it. Total shite!
TurtleRecall
Just tighten them up a bit more.