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Setting toe-in is simple, but you must achieve some sort of accuracy. To do that, lift the tire and chalk a band around it, and then spin the tire while having some hold a screwdriver blade against the chalked area. Brace the screwdriver on a jackstand or something. That will produce a line around the tire that is perpendicular to the axle. Now you can measure between the lines at the back and the front. The difference should be about 1/16 of an inch closer on the front. I also use the tire for the measurement IF the tire has a circumferential groove in it, which many do today.
After each adjustment roll the car back and forth at least five feet and steer ahead again to take the squirm out of the tire.
Centering the wheel if it is off after this is a matter of moving the tire rods an equal amount in the same direction, in other words extending the one towards the needed correction (if the wheel is steering left when going straight ahead, steer the left tire into the correction, which on a Volvo means lengthening that tie rod, and shortening the other by the same amount.
You can also pull the steering wheel and center that way.
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