The accelerated wear on the 2 (left/right positionned) depower lines ....
Is increased because the lines push on each other while steering and sheeting in and out
It rubs harder on the side walls of the metal center hole...more friction = faster wear
I have seen my North centers holes get gouged with a channel groove !
When this happen a sharp edge appears at top of centerhole creating even more wear
Solution would be 2 (front/back positionned) depower lines instead with separate center holes
This by the way lines up the 2 depower lines with only 4mm width instead of 8mm
Fits easily between 2 fingers when holding bar with one hand over the center area
Similar to what my Sensor bar from Core has
Additionally it sorts out twisted lines after a spin ....
By just pulling the bar all the way down (doing that does create some minimal wear in the long run)
Or simply by untwisting manually (using fingertips) under the bar with ther white tab end
...similar in a way to North Rotohead system
IMO the Sensor bar is cutting edge technology and should work on all the North 4 line kites
You will not save any money however....i think it costs the same
But you would have to do maintenance less often
And when needed it really really looks Supa easy to replace the depower line
German engineering .......and simplicity