Kingpin suspension confusion

[todds]

I've been trying to disassemble my kingpins and am running into trouble separating the upper control arm outer hinge from it. The big nut on the rear was easy to take off, as was the little nut on the front and the lock plate. I could easily rotate the camber adjustment via the larger front bolt (after paint marking the original position) I figured I should just keep rotating it to get it out, the glenn manual I have is unclear on this part, however when I do this the kingpin itself seems to just screw fore and aft inside the control arm bending the "tangs" of the arm slightly. I didn't turn it too far for fear of braking or bending something permanently. I can see that the caster adjusting washer with the little notches in it rotates with the rest of it. I tried holding it steady with a flathead but either it's frozen or that's not how it works. Can anyone shed some light on how this happens?