This image shows the same broken Dughwede funnel neck from below. It seems that the funnel was connected to the top after the pot had been shaped up to the neck. The next series of images shows how such funnel are made in Dughwede.
The Dughwede, like the other groups of the Gwoza Hills, do not have an endogamous smith/potter group so anyone can make pots. However, some people are more skillful than others and these often become the specialists. Most of these are women. I asked a Dughwede potter to make a funnel pot for me. She was happy to do it but explained that people had stopped requesting them and that she finds them difficult to make.