Checkball Removal
WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Courtesy of GENERAL MOTORS CORP.
IMPORTANT:
Do not use a magnet in order to remove the checkballs. The magnet may magnetize the checkballs, and the checkballs may attract metallic particles.
Remove the seven checkballs (26) in the channel plate.