[OXO cube]

as suggested 
   
now with minimum side to side / vertical / front / back movement 
zero wheel wobble 
glued and trued wheels and tyres ( zero gripped )


small trimming required to the guide holder 
wheels now turn very freely , this imo is a huge upgrade to the original setup 
but the proof will be when it runs against other cars 

guide flag wiring may be next , because the guide centering spring can no longer be used 
therefore the wires will most likely be needed to reposition the guide straight after any de-slot 
but thats another story 
thanks Alan and Chris for your input 

Kev