The servo saver does not put pressure on the servo. All it does is present a "shock absorber" between the front wheels and the servo itself. If the servo saver is too tight, the front wheels will turn just fine. If it is too loose, then the front wheels won't turn as much or at all.
Try this. Put the car on a stand so the wheels are off the ground. Turn on the radio and then the car. Hold one of the front wheels with your hand. Look at the steering servo arm and turn the wheel on the radio. If the servo arm turns and the wheel that is in your hand doesn't push your hand then your servo saver is too loose. If the servo arm doesn't turn then the problem is at your servo. Either the splines on the servo arm or stripped or more than likely the servo itself is stripped. Either way, your servo saver being too tight will not cause the problem you are describing.
That servo you and your brother are using is just a matter of time before they break in the application you are using them in.
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