The "Trick" to CA hinges is to drill a small hole (about 1/16" - 3/32" ) in the middle of the hinge opening so the CA can get in there and penetrate the hinge and wood. If you are overly concerned about the center part of the hinge being stiff, mark a line on it with a crayon on both sides - the CA will stay out of that area.

When using the flat pinned hinges or the Robart hinges do not forget to inlet BOTH surfaces for the hinge area. Failure to inlet both surfaces will result in large gaps.