Last season at a round with my Sea Ray 1978 A1 GM305 the steering stuck at a turn to the right if i remember well.I turned the oposite side and the again to the right and no problem for the next few weeks.Now at the garden when pushing by hand the sterndrive to the right i feel something to stop it .I pull it a litle back and i push it again to the right and no problem until the end of the motion.But sometimes i push it to the end without this sticking.What do you believe is going on?Is it serious?