Throttle connection
It might be a lot easer to just visit a good hardware store and ask for a cable connector. They will be in the loose nuts and bolt section. Basically what it is, is a small diameter round connector (sort of like a doughnut with a hole in the side of it) Your cable goes through the hole in the side and out the other side. The cable is held in place my a screw mashing down on it from the top. Another screw, screws in from the bottom after going through the throttle lever on your HF motor. Here is a tip. Use a hack saw and cut off most of the throttle lever. It just gets in the way of the cable.
Hope this makes sense and you can find the part I am talking about. They are common. Good luck!
Mike