This was a very expensive lamp 35 years ago. The two rotating pivot points have to adjustment screw or nut. They were held by friction but now won’t hold at all.
There is a brass “cap” which I assumed concealed an adjustment nut as this is the only way the parts could hold together. But I’ve been unable to remove or even budge it. Screwdrivers and wedges driven into the gap between the cap and base seem to only bend the brass and lubricant hasn’t helped. See photos. I can’t figure out a better tool or approach. Appreciate thoughts.