Didn't pull it out the head, but should be just a standard ball joint.
The feet not touching while on the chair is really a fail on their part. Its funny, its semi-acknowledged even in the instruction manual. Reading it to see if there was a way to lower the chair, which I don't think you can. The picture in the booklet has him in a position that his feet is touching the ground but you see he is in a semi weird half squat position in order to achieve it. Suppose if the wheels were pulled off, it that would fix the problem.
So obviously the 1/6 creators have a problem with chairs....
Same problem with HT Emperors throne
Sent from the inside of a giant slug in outer space.....