You install all the hinges in that particular control surface dry, it should be completely assembled with no gap, before you apply the glue. Then you deflect the control surface (slightly past the throw you are trying to achieve as someone stated earlier) and apply a few drops of CA on each hinge, working down the hinge line, I then come back to the 1st one and apply a few more drops, and so on, untill the hinge no longer soaks it up, then flip it over and deflect the surface the other direction and do the same thing. If you have a loose slot and the hinge wants to just push into one side without being distributed 50/50, you can stick a small pin through the center of it, that will allow it to only go halfway in, then once the control surface is pushed up tight, take the pin out before gluing. BTW, you must use thin CA for these.