I was in the building room of a friend, he was building another 3,5 m ws all wood glider, one of the marvels he astonishes us with.
He handed me one of the wings he was finishing, and what struck me is that the ailerons and flaps fell from their own weight to the down position, wing up or upside down. Oracover (thermal shrink plastic covering) used for hinges.
Wonder why his servos very rarely fail?
I am ashamed as my own clumsiness as a builder.
I wouldn`t worry about that, depron is about 5 times lighter than wood so the DWT hinges I use are strong enough to hold the depron control surfaces in position with very little resistance for the servo.
I understand what you are saying some people are just masters at building and painting.