Hello, I have a craftsman 358.797150-32cc trimmer, actually i have 3, and they all seem to have the same trouble. On carburetor reinstall, the throttle cable seems to crack the butterfly and progressively increase the throttle beyond idle. I've repositioned the trigger, lubed the cable sheath, wiggled and finessed it all I can but it still does it. The cable part # is 530-037498_B any ideas?