XRAY - Model racing cars

Can someone explain what these shims are on the X12 setup sheet and exactly where they fit etc?



Thanks
Skiddins

they are to increase the length of the top arm for less camber change. to fit them you have to dremel off the little bit on the lower arm that caster part fits on. I use the 7.5 outer diameter shims from the touring cars

So I was right in thinking;
A) you have to mod something before anything can be fitted
B) There is no reference to this adjustment anywhere in the manual.

Is it virtually a standard change to make and what does it do to the handling?

Skiddins