The only contentious thing from the above is the concept that it's POSSIBLE to have one front wheel 'toed' by 2mm and the other by a DIFFERENT amount..... that is NOT possible as it misses the concept being tracking.....
The 'tracking' is NOT controlled by anything other than the angle that the wheels sit if you drive on a level track with matched tyres/wheels (etc) and LET GO OF THE WHEEL.
Obviously, if something ELSE is misaligned, then it MIGHT be possible but, if everything else is correct, then the 'gold-standard' of tracking is the position the wheels adopt if allowed to 'adjust' themselves. YES..... the steering wheel and column MAY be at some BIZARRE angle when the kart is 'tracking dead-ahead' BUT that is NOT a fault in the tracking..... it's a fault in the setting of the STEERING column or wheel..... not the tracking!
I suspect that some people think that that position of the steering column or wheel COULD be the 'gold standard' it is NOT..... it's the free-running position that the wheels and track rods assume with no other input. And... with a straight, properly set up, kart that will ALWAYS give the SAME angle/mm or toe in/out on BOTH wheels!
Ian
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