basically, straighten the wheel, measure the distance between the backs of your rims, and the fronts at 9 oclock & 3 oclock. undo the locknuts on top balljoints and rotate the steerin arms to get the measurements the same whilst the wheels are dead str8. (getting the wheels to track straight whilst wheel is dead ahead.) they wind in and out to toe in and out, but if they are of equal length then lock is equal assumin you put your wheel back on how it should hav been. if you're a whole turn of the wheel out then it'll be obvious as arms will be massively unequal lengths.