Yeah. Something like that. The cable goes down into the carb, through the rubber boot at the top. Inside the tower are a spring and a vacuum cone. The cable is passed through the cone where the ball catches the top of it. As you ask for more throttle, the vacuum cone is lifted, drawing in more fuel. If you are familiar with the Kehien carbs, used on many different American and foreign bikes, you will be familiar with this carb.