PROBABLE CAUSES:
1) ROSETTES and SHORT PLATES MIS-POSITIONED, CAUSING BINDING. SOLUTION: loosen mounting screws, push rosettes up slightly, make certain screws are vertical, re-tighten screws EVENLY
2) LONG PLATES MIS-POSITIONED, CAUSING BINDING. SOLUTION: remove mounting screws from one side, and remove trim. Reposition trim so there is no binding. Install screws in new position.
3) LARGE 21MM NUT ON INSIDE OF ROSETTE/PLATE TOO TIGHT> SOLUTION: loosen nut 1/4 turn and check