Maybe I’ll clean the head and or replace the gasket on my spesh air tool pro pump. I like the pump overall.
not sure why putting pressure on a deflated tire would stress the tube? It would not push on the side of tube during the latch on. Anyway I’ll just be more careful. Alas since I ride three bikes with tubular wheelsets many times they’re flat from normal air loss by the time I get to ride one again.
but now I know why I had that weak stretched place!!
just a photo of the stem section