The cable clamp solution will work just fine, however first check to see how the cable is connected at the engine end. Most "Morse" type cables have a connector at the engine end of the throttle cable (mine has) that consist of a small screw in a sleeve holding the outside cable in place. If you tighten this screw just ever so slightly it will increase pressure the same as the cable clamp on the inner cable thus providing the proper throttle resistance. Voila no more loose throttle.