Make sure when you are ready to do your hinges you do a test fit to be sure they slide into both the wing and the aileron tight but not so tight that they are binding and bending.Second make sure you leave a small gap between the wing and the aileron so it has an easy range of motion(it will be a very small gap,you will be able to see light through it and thats about it).Third when you are all lined up and double checked your ready for ca, I usually use 2-3 on each side and the hinges will soak it all in thierself. If there is ca dripping anywhere then you've used too much. The pin is just to make sure the hinge doesnt slide too far into either the wing or the aileron leaving not very much for the other to grip to. I have never used this method myself I've always just eyeballed it and havent had a problem(knock on wood) but I wouldnt say this is the best way.