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There are the mechanical links and fasteners on the rear suspension. You can dial in what you want but there will be some give in the tire sidewalls and no doubt a bit on your suspension linkages so actual settings will change slightly under flex from loading.
The thing about changing needed turning from 9 t0 3 sounds very extreme. It is hard to imagine how this can happen.
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Cobra loving, autocrossing Grandpa Architect.
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