I have real problems with my Tubolito tubes in that I’munable to stop slow leaks from the valve stems. The metal valves seem unable to make an airtight seal with the ‘plastic’ valve stems. I’ve tried plumbers’ tape and even glue to try to form a seal, but the leaks continue, albeit at a slower rate. Today I had to reinflate my rear tyre after 10kms, and then the Presta head on my Silca Tattico pump wouldn’t fit over the stem. I had to use a Schrader adaptor to get some air into it! This is the case with both tubes, not just one, and has been the case since I first began to use them. Not