Today I tried to unscrew the valve core from my RideNow TPU tube, and it absolutely, resolutely will not budge. I even had the valve stem in a bench vice and tried to unscrew it like that, and all I managed to do was to twist that plastic valve stem all over the place (I'm kind of amazed it didn't break!). But somehow it just refuses to budge.
Anyone else tried to remove the valve cores on these tubes?