How to get headlight adjusters working??

[bubinga]

I am assuming that there is a ball or something inside this Square black plastic thing in the picture, I soaked everything with liquid wrench, but the black plastic thing is turning, and I am pretty sure it's not supposed to.
Am I going to have to take the adjusters off or something To get it to work right?
I have an extra headlight assembly here, I figured I would try that one first .but my right headlight is way off.