[OXO cube]

hi guys        
got a few old scally junior F1 cars off fleabay 
thought i would have a bash at refurbishing them 
namely a Lotus C67 , Porsche C86 and a BRM C72 ( so far )
all have cleaned up well 
motors although not the strongest all run well enough after a little TLC 
the tyres as would be expected on such old cars need replacing especially the rears if i wanted any kind of grip 
any suggestions for tyres ? 
   
but my main issue is the front wheel steering assemblies 
the wheels are extremely loose on the axles and wobble around like crazy 
is there a fix ? or is it just age ? would new assemblies be the answer ?
i have found lots of info on these cars and have used this info to get them to where they are now 
but have found little with regard to the steering assemblies 
any help / info would be gratefully received 

Kev