Hi, i have a Hobbico Sukhoi su-31 and since it was my true first ARF, i did not know the proper way to install hinges and the control surfaces(Elevators, Alerons, Rudder) and when it was glued, there was a gap in between the surface and where it was glued.(a little smaller than the size of a medium size nail). anyway, the guys at the field said that it is enough to get away with but it will cause "flutter" and i was wondering how you fix a gap in the control surface. any advice is welcome Thanks