Thanks for the input, but I didn't explain properly, did I?
My rally track has a couple of points where the braids lose contact with the rails. This is only a problem with the few cars I have that have fixed guides. The likes of SCX cars don't have the problem because their guides will drop far enough for the braids to stay in contact.
I know I could address the issue by reducing the dips in the track, but in the 1:1 rally world they don't alter tracks to suit cars, they do it the other way 'round so I thought I'd try to as well. I suppose I could always replace most the offending cars with SCX equivilents, but they haven't made some of them (2-door Impreza, for example).......
VBR
Stuart.