Hi Guys
You can download the Naish Shift System Manual from here
www.oneopensky.dk/page-not-found and rig your own from that, this system is the same as Norths 5th E, but I would go for the rig posted earlier it's much easier to rig and just as good.
The trick is to get all five lines the same length and set your nose lines correct for each kite, the section in the manual shows how to get this length right.
The fifth line should be set just loose when flying normally, but this changes in every kite so you need to tune it.
If you just want the fifth for relaunch and leash leave it quite loose and it won't effect the kites normal feel at all.
If you want to see how your kite performs with 5th helping rigidity tighten it up until it just becomes tight.
You also need to set a bar stop that keeps a little tension on the flying when you release, this stops the kite from hovering upside down off the water when you release. The stop should be set just a little shorter than the length of the nose line. If you use the same bar for multiple kites then this stopper need to be adjustable and repositioned acording to the kite you a using, just mark 5th line for your different kites.
Hope this helps
Cheers
Pete
www.addictionkiteboards.com