Catch Base Pro Make Primary Sidebar Width Narrower

Hi I would like to change the primary sidebar width so that primary sidebar is the same width as the secondary sidebar which is narrow. The aim of this is to make the content area wider for posts with equal size narrow menus on each side as I only use narrow widgets. There is already a setting for this but it makes both the sidebars equal primary width where I want equal secondary width because it is narrower. Any help appreciated. Website: kentparanormal.com.