[Scuderia_Turini]

Hello Kev,
You might as well go all the way and fit an axle that allows the wheels to rotate independently.  Slot.It do a kit comprising a hollow axle with ferrules that fit in the ends with a washed to hold the the wheel in place - PA39 "Independent Front Wheels Axle". Uncle Dennis (apologies if it was Uncle  Chris !) showed on the chat a trick of having one wheel fixed to the axle and the other rotating freely.  You could do that with the PA39 kit so you would only have to modify one wheel.
Available at a Slot Car Dealer near you.

Leo

Linky to Pendle SR