I forgot to add the following...
TYhread a rod into the ball link with a set nut attached. DON'T use all thread rod it is weak. Measure from the ball link/control horn and run the non threaded rod thru the quick connect set screw . Center your servo with the radio and center you control serface at the same time. mark and cut the rod (marks alot works great.) leave about 1/2 to 3/4 inch of rod sticking out past the servo set screw for adjustments in length. Center again as before and tighten the set screw down. I add a drop of thin CA at this time to make sure the setscrew doesn't loosen by accident, but it will break loose later if you need it to. Hope this helps.
If this isn't clear PM me and I will attach some pictures.
Mike