Dale,
The hinge points work very well. If installed correctly they rarely pull out. It seems like the CA hinges always come out over time...the hinge points do not. I have an old Big Bingo with hundreds of flights on it using Robart hinge points with only one at the top of the rudder that came loose. 12 years and going strong. I encourage you to look at as many pictures as you can on this subject. The leading edge of the control surface will have to be trimmed where the hinge point lies to put the center of movement into perspective. I have an example right now up on my building board that would show what not to do. I have many examples of how it should be done.