How to design the steering clearance of the rack and pinion steering gear?

How to design the steering clearance, I think the influencing factors of the steering clearance are more complicated, such as the selection of the universal joint, the machining error of the parts, the installation error, and the stiffness of the steering system, so I think it is difficult to estimate how much it can have before it is built.Even if the tolerances of the parts are designed, it is difficult for the final processed parts to meet the requirements. It has to be modified manually. I can only hope that it is as tight as possible, and the bolts are tightened during installation. If the universal direction can be reduced as much as possible If there is a gap other than a knot, it is generally less than seven degrees when it is created.