Hey guys, I'm sure this has been discussed but I can not seem to find it any where.
What does shimming underneath the side links achieve?
On the 12R6 setup from Nats that AE has from Kevin it shows him using a .5mm shim under the front ball of the link and none in the rear? any idea as to why?.

Here is a link to the setup in reference,

https://www.teamassociated.com/pdf/c..._Nats_2017.pdf

Thanks for any and all help in advanced,