One big Campy dealer in Chicago is Lickton's Bikes on Lake Dr. in Oak Park. They aren't the most sociable folks but are Campy experts.

BTW, did you RTFM (Read The F****ing Manual), i.e. did you read the instruction booklets that came with your components? They are also available in .pdf form on Campy's web site. A careful reading of these should answer most if not all of your questions.