I've got a throttle cable that just locked solid out of nowhere. It was working fine, no signs of binding or sticking, but then the next time I went out I couldn't twist the throttle at all. I pulled the cable off and tried to lube it, but still nothing. I get maybe 1/8" of free play from either end; there aren't any crimps in the housing and I've gone through the housing and bent it back and forth from end to end to see if I could feel anything, but I can't find any obvious reason. Is there anything I can do, short of just pulling on it until it either gives way or breaks? I've already pulled about as hard as I'm comfortable with.