Next step is to work on the aileron servo installation. I opened up the servo hole by cutting down the center, then a diagonal cut from the corners to the center and ironing it all down into the servo hole. Once the servo is in place. Use a small drill bit to pre-drill the holes for the servo screws. The servos did come with fully threaded screws, so I used them. Use the screws to kind of tap the hole, by turning it in 1/2 turn at a time, then backing it back out, and going another 1/2 turn in, until the hole is threaded. I put a drop of thin CA in each hole to harden the threads before installing the servos.