Why complicate an easy installation?? MinnFlyer has also demonstrated why you should stick with what the plane was designed for.

On a scale plane such as the J-3, there is no reason at all to go to hinge points. The surface loads are low, and so are the speeds. I use CA hinges on every one of my planes up to 1/4 scale and never have problems. Even on my large CAP and Giles with 40CC engines and speeds approaching 100MPH.

If you want a bullet proof, good looking install, try using the CA hinges and then using thin V-shaped strips of clear ultracote to seal the hinge gaps from underneath. You will never have a problem with CA hinge failure or surface flutter again.

DP