On the dashboard of my 6C2500SS Touring coupe there is a rotary knob connected to a cable that is supposed to operate the throttle. I assume this is for adjusting the idle speed from the ****pit . On my car everything on this control is damaged, partly missing, and the parts do not look correct. Does anyone know more detail about what this control looks like and how it connects to the engine throttle linkage. Are there photos? Does anyone have parts available I can buy or trade?