[StuBeeDoo]

I have several Team Slot Audi Quattros.  Most of them have the "standard" chassis - fixed motor mounts are the most obvious distinguishing feature.  These all run fine on my track.

One car - the yellow 555 China Rally livery, has the "Pro" chassis - the type with a separate, screwed-in (a bit like a Slot.It) motor mount.  This is the one that is causing me grief.    

Both types of chassis came with the same type of guide - all  the dimensions are the same, I've checked them with my vernier caliper.  However, the blade on the guide is <6mm deep.  I suspect that the guide support must be a little higher on the Pro chassis.  I've adjusted the front ride height as much as I can without the tyres fouling the body, but still the car keeps de-slotting.

Any suggestions how I might overcome this without resorting to too much butchery of the chassis??

Thanks in advance,
Stuart.