If I use the Robart hinge points, or BVM's new CF hinges I make I drill the hole for the hinge then drill a second hole at 90 degrees to it through the bottom surface of the wing, or control surface. I then fill the hole with aeropoxy, and insert the hinge, then take the aeropoxy and squirt it into the 90 degree hole, this effectively makes a glue pin and that hinge ain't goin' nowhere!