Any recommendation from my fellow self-spannering types for robust tyre levers? I used to rate the park tool brand, who generally make good stuff, but I've had one too many of their blue plastic ones snap on me. I always carry a spare with me just in case, but I've lost trust in the product now. Maybe it's user error, but they should be strong enough to get on a tight rim/tyre combo and maybe outlive a rim which they haven't yet. I hear metal levers can pinch tubes, but don't know how true that is. I think it might just be a material limitation of plastic and not much to do with the construction method.