Adjusting the valve clearances in my F22B1 engine (16 valves).

I am to the point where I have the feeler gauge inserted, a wrench around the locknut, and a screwdriver in the 'feeler screw' I suppose it's called.

It's almost as if the nuts on all valves are freakin WIELDED to the screw.

When I try turning the screw, the nut turns with it.
When I try turning the nut, the screw turns with it.

No matter how hard I try, they wont seperate. Am I doing something wrong?