It is always difficult to explain in writing how a set of moving parts works in relation to each other and when in addition it is necessary to translate into a language that we know as little as I know English, it is almost impossible. . A drawing would be more meaningful and I will try to make one.
But I can still explain that the modification of the caster is obtained by moving the upper ball joint in a direction perpendicular to the axis of the steering linkage. The ball joint actually moves in an arc of a circle but, for an angle of 3 ° the vertical displacement of the ball joint is only about 1mm, or about 0.5mm at the level of the steering rod, which can be easily compensated with shims under the steering rack
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