RE: Hitec 5645 servos, Are they good servos?
My vote is also a no to 5645. Very pool centering. Have sent two to Hitec for repair and both came back the same. I would not even use them on non giant-scale applications.
5945 and later models are good though. Futaba servos (e.g., 9101 9202 etc nylon-gear ones) are also good on centering.