Hey you guys, I figured out a new solution to the jack rattle problem. This solution doesn't leave something weird on the end of your cord or fall off from disconnecting the cable. It is not visible when the cable is plugged in. I now have zero rattle coming from the jack!
If you look at the female part of the jack you will see a small gap in between the gold and the silver part of the jack. The noise is cause when the gold part gets loose and hits the silver part. All you have to do is get 2-3 small pieces of paper and push them into the crack. They do not need to go very far in. I had a long piece so that I had something to hold onto. Once I pushed it in I cut off every thing that was sticking out and tucked the remainder back with tweezers. If you are having a hard time pushing the paper into the crack, stiffer paper can help a lot since it doesn't buckle as easily.
Hope this helps!