On the BJ4 (original) I went from a heavy duty servo saver like this tamiya one - to a solid arm. The difference was definately noticable on our high traction surfaces.. the steering felt a lot more predictable and solid.. It just turned like you wanted..
The zip tie is probably almost as good though and like you say, it protect stuff better. The forces were enough to break the solid arm, so you can imagine the forces on the servo. maybe better to have slightly sloppy steering than none !
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