The steering rack is so simple with one moving part and it is as free as many ball raced set-ups I have built before.
As Racer's online build mentions, the idea of the grooves is to ensure dirt doesnt affect the action. Of course with the US only racing on dirt tracks, if anyone would find a problem it will be a TLR test driver.
The tolerances (gap between fixed and sliding moulding) are incredibly small to avoid slop and create a smooth action. The open side of the rack system faces towards the rear of the car so the chances of dirt getting in I think is pretty low.
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