Question for those of you using Robart hinge points on pre-built ARFs: how do you know there is enough material (ie. thickness) to the wing trailing edge and ailerons (if built-up) to securely anchor the hinges. Robarts require at least 3/4" thickness in the balsa it's going into to be secure. Are you guys opening up the wings to check this and make required modifications??

When building from a kit, I usually instal Robart hinge points, but on an ARF, I use the supplied ca hinges and haven't had a problem. If you want to be extra safe, just add one or to additional ca hinges per control surface and the installation will be bullet proof.