WARNING: This page is about a different car, the 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Inserting Spring Into Gear
Courtesy of VOLKSWAGEN UNITED STATES, INC.
Bent end of spring (arrow) must be hooked into hole of sliding gear.