Fastlane A arms
 

I got me a set of flm a arms today. I was noticing that the top ones have 2 holes in them. One is factory and the other move the knuckles. What hole is better for what? Does it really make a difference?

i would assume the rear holes will alter the caster. the further back, the quicker and sharper it will turn.

I was wondering the same thing when I put mine on. Might be for caster???

I put it on one way and try it. Put it on the other way and try it.

im pretty sure its to alter the castor. try it and see. i bet you will like it better using the rear holes.