Prongs aka Harpoon Connectors on Mattel Fashion Dolls

Below is a photo illustrating what I meant by "a prong on top of a blob." Usually, Barbie's necks are topped by a small tapering knob. With the Flavas girls and some other fashion dolls, the neck ends and instead of just a knob, there is a blob of "flesh" on which a brown harpoon-looking device is fixed. So fitting a new head to the body is that much more trickier since the new head has to cover both the prong AND the flesh blob.