I tried taking the cap out of my premium carto...it was the hard kind and now the cap won't go back on (well stay on is more accurate). I was freaking out and didn't like the idea of tailpiping it or leaving the filler exposed. Then it came to me...CONDOM!! I took the condom and cut a hole in it and slid it over and am using it for my cap now! It's ugly as can be but it works! 