I use cable most the time or just use a piece of piano wire and bend a U into it so it comes from forward of the engine back to the throttle. I have a blown up copy of what you have shown on my shop wall to remind me of that set up and just make up my own. The system works slick as can be but I can usually get the throttle set up with the cable and yellow nyrod. That system also looks cool if you have an exposed engine.