Allowing the front wheels to turn independently form each other will reduce the roll resistance in the corners. On a 85 mm wide slotcar this results in a better turn in.
A simple way to achieve this is to modify the standard axle.
Two slots are made on both ends of the front axle to hold the wheels in place with e-clips. Fine tuning of the axle play can be done with the black Plafit spacers. An off the shelf Free wheeling front axle is the SSH front axle with a M2 tread. They come in 2 widths and can be ordered at SSH directly or MSD. 55mm wide: #WG055, 75mmwide: # WG075
 
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