Make sure you are using a servo saver that is for a Hitec servo. If it doesn't say for Hitec or say 24 tooth spline then it does not fit our servo.
Second, if the radio does not have any end point adjustability then you will have to do this mechanically with the steering linkages to prevent the servo from trying to travel past the mechanical limits of your steering knuckles. If it's not setup properly and the servo tries to move past the mechanical limits of your steering geometry then you will end up damaging the servo.
Third, if you are stripping the gears inside the servo then you need to A).use a better servo saver
B). stop crashing into things
C). move to a premium level servo with a even stronger gear train like our Titanium geared servos.