How do I tighten my rear view mirror - it jiggles around like crazy and I can't figure it out.

Oy!  I can't remember having to tighten a mirror on a car since the 1970's!  If nobody responds ... check the owners manual ... or stop by a local Chevy dealer.  Ideally, someone in the service department should be able to spare a minute or two as a measure of goodwill ... to show how it is done.

Good luck!