Hi Loeuftok,
The 5th line is used to support the SLE canopy of the Ozones, not as a flagging safety.
It sounds like the bar might not have been modified at all. The 5th is connected so that when the trimmer is pulled in, it pulls half as much front lines as 5th line.
The leash should connect to the front line flag out handle, which is a non spinnable safety for beginner riders, or suicide.
IMO the 2007 bar is much improved with the addition of a spinning chickenloop, I used the Ozone megatron, remove the old metal swivel, and if the kiter has long arms remove as much of that dangly trimmer as possible.
Also check out the Velcro that holds the front line flag handle in place, the velcro is too strong and needs to be cut back so that there is only just enough to hold the handle in place.
The link that Panchito posted should help you, I know this isn't exactly what you want, but it shows how the trimmer works-
http://downloads.flyozone.com/kitesurf/ ... EEDURE.pdf