Hopefully this helps someone. I had an aileron servo on a Tiny Trainer lock up when glued down. I took it apart to see if I had melted the gears and I had not. The potentiometer (position sensor) under the output shaft had been overheated and locked in place. This was a 4.7 gram servo and fortunately I had bought some extras. I recommend keeping your glue blob away from the output-shaft side of the servo when gluing them in place, and putting glue on the foamboard rather than the servo probably is wise too.