If you look in my #1 photo where I cut the slot you can see a center hole I drilled, this is a must do thing when installing CA hinges if you want the CA to wick all the way through a CA hinge. I'm not sure but I think Mike or Ken showed this in a thread about using CA hinges. I don't use them on my planes but I have installed them a lot in planes I have built for others and never had a problem with them. There is no reason why I don't use them, they are fine if installed correctly, I try to use hinge pins if I can on my planes, just because they are easy. I end up using more of the Dubro flat hinges though depending on the edges of the wood, TE or LE. It's just one of those choice things, I often mix them too, use pins and flat. The little plane I'm building right now I'm not sure what I will be using?? The wood for the elevator and rudder is only 3/16 or 1/8 thick. I'm thinking of adding some wood and using the pins for the small electric planes. This is an old 1/2A kit and my first stab at electric power. As small as it is I'm still cutting a lot of lightening holes in it. Not needed but just beacuse!![8D]