I put ca hinges into an ultra stick wing last night. The provided hinges had a large oval hole in the center. The instructions called for punching a pin on one of the sides of the hinges in the center (font and rear) creating another hole. That seemed like it would just weaken it further. I didn't do it. I just dug the slots out enough that when the hinge bottomed out it was in the center. I didn't wollow the hole out either. I know I must have gotten a little on the hinge line because the gap was very small. Movement of the flaps and ailerons are free. They flop back and forth when the wing is turned over. The ones on my avistar are a little stiff. They were a different style hinge - much "fuzzier". Who makes the best ca hinges?