Eunny Jang did yeoman's service a half-year-ago with this bit on: See Eunny Knit!: Technickety: How to unvent a simple cable. Lovely work. Very clear. All can benefit.
It also reminds me of what I heard on Pointy Sticks most recent Podcast: if you don't know it's hard...it isn't.
So, too all who haven't heard otherwise--Cables are EASY! Go to it!