I found heavy tubing about the size of the cable. My mechanic was hesitant about spliting the tubing, stretching the cable taunt, and securing both ends.
I have not looked at the attachement under the cover of the cruise control. My problem is the same as other poster; since there is slack in the cable, the throttle will not open as much as you would like, even though the cable has been pulled to the frame with a ziptie. Not pretty.