Does anyone make a 510 cart without the little end cap? I'm new to the 510 (kr808 and 510 cartos) . I tend to bite on the round carts and the end pops of in my mouth. What a pita ! If my hands are full, it is a REAL pain . I think I saw a post about this, but can't seem to find it. I don't care for whistle tips much. Thanks