On our car the eccentric will be rotated to bring the control arm in toward the centerline of the vehicle. This will bring in the lower edge of the tire, restoring a more nearly vertical condition. Still, a little negative camber is desired in the setting to keep the tire contact patch as flat as possible during cornering. This will aid adhesion and prevent running on the outer sidewall during hard cornering. On earlier cars this eccentric wasn't present and lower control arm position was fixed in this respect. Camber was adjusted by adding or subtracting shims at the upper control arm.