WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
Place the snap ring on top of the spring retainer, and then set special tool MD998907 as shown in the illustration.
Compress the return spring and install the snap ring.
Fig 1: Placing Snap Ring On Top Of Spring Retainer