Does anybody make 70x25 tubes anymore with a non-removable valve core? I'm ready to dump my Lezyne portable stand-up pump, and a CO2 assembly I wanted to buy also cautioned use with removable valve cores, since unscrewing it might pull them out. I used to request tubes with solid valve cores at the bike shop, but now I'm told no one is making them anymore? When I look at tubes online, the valve core type is not mentioned in the specs, except for the Specialized ones.