FWIW: If you don't get any responses, you might just consider getting a quad-line FB bar.
The only thing you would have to do is when connecting the single brake line from the kite, make sure the larkshead knot captures both pigtails
coming from the pulley.
If you want to be CDO (like OCD, but alphabetically corrected), on some FB quadline bars, it's simple to swap out the pulley for a length of dyneema.
There have been a few quadline FB bars languishing in the For Sale section for a few months now.
There also a couple of NIB HQ Quadline FB bars from a liquidator in Ventura California being sold at clearance Buy It Now prices. He has 100%
feedback and there's free shipping on the items. He currently has 2 20" bars and 2 24" bars available depending on the size of the 3-line wing you
are trying to loft.
Generally speaking the quadline bars bars are a bit better appointed than their 3-line brethren with nicer padding/flocking. The HQ bars even include
below the bar top-hat releases in case you have a truly epic "Oh Crap!?!" moment where releasing the wriststrap would be too slow.
Just a thought....
ATB,
Sam
"I never had any friends later on like the ones I had when I was 12 - Jesus, does anyone?" - The Body by Stephen King