The changes during the track tuning process are fairly small and won't effect the geometry enough to cause problems. Typically the street alignment is done with shims and a race setup is done while on the machine using the links. That way the links can marked and easily duplicated at the track.
I agree that using adjustable arms does change the UCA length which in tun changes pretty much every aspect of the geometry as a whole, but as long the changes are small the geometry changes are minimal and not of any consequence.
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Dennis
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