Normally the slop in the steering is taken up by the forces on the car when it moves. Normal wear is not a problem. Generally the cars are harder to drive if all the slop is taken out.
If the car is uncontrollable, it's more likely to be a problem with the servo horn or servo saver (if these are a bad fit or too soft then the steering won't return to centre properly), or the servo itself, or damage/wear/binding in the suspension/transmission.
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