You can read about the upgrade more in the 6yE sectionWe have been informed at the Expo that 6Ye Premium have just upgraded their quick head connector to 2nd generation. This upgrade not only keeps the non-swivel head feature, but also make sure the head can move with the neck.
https://www.dollforum.com/forum/viewtop ... 83&t=89528
Best,
Jeff and Nyoko