WARNING: This page is about a different car, the 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Crankshaft Balancer & Bolt
Courtesy of GENERAL MOTORS CORP.
Remove the balancer retaining bolt and washer. Discard the bolt.
Remove the balancer using a universal removal tool.