I think, but don't quote me on this as I asked it a while back and didn't receive a reply:
If you put washers under the ball studs on the steering rack Ackermann is increased.
As Ackermann is increased it gives the feeling of more mid and exit steering.
Less Ackermann, so less washers, makes the steering feel more direct initially.
I'm happy to be corrected, but that's roughly how I understand it.
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