Hi Chris
If you are using the same pole as Jeff Brimble recommends(MapF16), then he tends to pair it with the No3 and No4 top sections from a Ron Thompson's Zensor Flex Pole. I know for a fact that the No4 section on the Zensor Flex fits perfectly into the Super-Lite gooseneck. If you are not using the Zensor Flex then I would imagine you would still be able to use it but might have to cut one of your sections down to get it to fit in exactly the right place. As the taper ratio on the Zensor Flex fits both the Super-Lite gooseneck and the F16 I would imagine the F16 taper ratio would fit the Super-Lite gooseneck (if you follow me!)
The internal diameter of my Super-Lite gooseneck is 21 mm at the opening narrowing to 20.5 mm at 740 mm in. Using these figures you can work out if this matches the taper ratio of your pole. I would imagine it would fit on your No4 section.