I initiated a thread about ca hinge failure this past autumn. I have used ca hinges in the past 6 or 7 yrs without failure and now I lost 3 hinges on my TF P-51B (red box) Mustang. I never lost the plane. I got some good advice and some pupu on RCU. When I built the Mustang I installed the control surfaces WITHOUT a gap. It looked good but a tension type stress was put on the hinges and they don't take it real well. I got one response on RCU saying that a ca hinge will crack immediatly if the hinge is bent where ca glue is applied. I put ca (super thin) on a hinge and attached it to my drill press and it was bent 100 times per minute for over 15 minutes and I spotted no fatigue. The was bent over a small radius also. I left a small gap on my P-51B and no problem although I only flew it 4 times since I fixed it.