Not the best photos but the only ones I have of this kite.You can see under the origional cabrinha neopreen cover (just under the swivel for the front lines) there is a jam cleat .Its a trapeze cleat of a sailing skiff/dinghy.It has a inbuilt pully at the top where the rope changes direction.
Setup........... It has a hole at the top,this is shackled to the front line swivel and covered by the neopreen cover(this is totally optional ,I thought it looked cool?)
It also has a hole in the bottom , This is where you attach the rope power/depower line ,It is tied with a bowline on the bottom of the cleat ,make sure to tie a figure 8 knot and attach a stopper ball about 100mm down from cleat ( this stops the bar going all the way out of reach and hitting the underside of the cleat .it also servs as a rest stopper for your bar ,while your cruising along you can reach up slide the ball down to the top of the bar where you want it to rest and hey presto the bar will sit there locked until you push the bar up or slide the stopper up .from the stopper ball the rope goes though the center of the bar ,then get yourself a single pulley and a piston clip ( This set up is on my big kite 14m so I don't unhook off this kite ,I use a piston clip Its a swivel clip used on spinnaker sheets and halyards on yachts and has a built in quick release which attaches straight to your harness just make sure you add a small lenght of rope with a ball on it to pull the safety,If you want to use the origional cabrinaha chicken loop you can you just have to carefully cut back plastic sheathing over the dyeema center line rope so you can tie it to the pulley).
After passing the rope through the pulley it goes back up through the center of the bar and all the way up to the built it pulley at the top of the jam cleat where it changes direction back through the cleat and back towards the bar .Here you need to work out where you want your maximum power setting to be ( I simply measured the max power setting lenght of the origional strap system ) then you need another figure 8 knot and a stopper ball , this stopper ball is the max power setting if you let the rope all the way out ,this knot / ball stops it at your max power setting , If you didn''''t put this knot in and just kept letting out rope you would get too much power in the kite and if you tried launching like this you would end up getting lofted......not good so don't forget the stopper and the max lenght of the rope....

After the stopper ball I have about 200mm more rope then another stopper ball this is where I attach my safety and with the little bit of exta length you can easily reach the depower strap with out leaning too far forward.
This system is silky smooth and has loads of adjustment ,also the centerlines 6mm speectra is like $2.00 per m and I have 2 or 3 spare ones cut to lenght ready to go should I see and wear on the centerline . (with over 100hrs of flying I had to change one after I noticed it was freying ,I found a bur in the stainless bush going through the center of the bar . a bit of filing with the old dremal sorted this out , second rope nearly done the same amount of work and shows no major signs of wear....)
shopping list you will need
1. Trapeze cleat (Ronstan I think and get he one with the inbuilt pulley) $25
2. swivel piston clip ( this is optional ?) make sure it has a decent quick release !$25 -
3. 6mm rope get one with good abrasive properties . you'll need 3m to start with ,that would be heeps .If you want spares get more and use only what you need.$6-$10
4. 3 stopper balls suit the 6mm rope.$2
5. 1 small d shackel to attach top of cleat to swivel below front lines.$2
6. single pulley .$20
all bits available at your local marine shop , I had all the bits accept for the cleat and rope...
http://www.biasboating.com.au/p-1151-ronstan-series-30-bearing-blocks.aspxwww.biasboating.com.au/p-658-ronstan-alloy-trapeze-v-cleat.aspxwww.biasboating.com.au/p-1104-swivel-bale-snap-shackles.aspx