I need to add a few more things to the pivot ball assembly sticking issue.
Slide a M3 wrench shaft through the pivot ball of the bushing and pivot ball assembly (you could use the king pin as well it's just easier with a wrench). Using a pair of pliers or something else you prefer. Hold the pivot ball bushing by the part that fits into the carbon arm. Squeeze with a fair amount of pressure and move the pivot ball around with the M3 wrench. Move the pliers to a new location of the pivot ball bushing. Repeat this until you've gone all the way around the pivot ball bushing, about 5 different locations.
This will loosen up the plastic and pivot assembly. When placed in the carbon arm after reaming the bushing hole in the arm a little, you should have a free moving arm.
No need to glue the bushing in the carbon arm if you're using the rubber o-ring to hold the bushing assembly into place.
Hope this makes sense. It's hard to describe.