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I'm on with a service at the moment and have to do the old TB balancing. However, when I last did this, not only did I lose the 'stay open' function of the fast idle lever, but I struggled to get to grips with the cable slack.

Since there is slack in the cable from the throttle to the cable splitter and then slack in the throttle cables from the splitter to the TBs, which do I set first and how do I know that it is right? Are they truly independent? If I turn the throttle do I not pick up the slack in both upper and lower cables?

As it doesn't seem to matter what I do to the fast idle adjuster it doesn't appear to be the case that there is too much tension in this cable (as though the cable is pulling the lever closed again) so how can I get it to stay in the open position? If there was a problem with the splitter box I would expect this to stick open instead. Ideas....?

the splitter is just a plastic bobbin with three grooves around its edge: the twistgrip cable is wound around one groove clockwise, and the two throttle cables are wound around the other two grooves anticlockwise- when you pull the twistgrip cable it unwinds off the bobbin..and the other two wind onto the bobbin. The bobbin is sprung-return back to its own dead stop - so you can have the three cables as slack as you like, independent of each other. The correct adjustment procedure starts with slackening off the twistgrip cable - to ensure that the bobbin is returning fully back to its stop. Then adjust the 2 throttle cables just right. Then finish off by taking nearly all of the slack back out of the twistgrip cable. As for the fast idle, that's supposed to raise the dead stop that the bobbin returns to, by a tiny amount. But its too tiny, especially if you have a reasonable bit of free play in the 2 throttle cables. Its not affected by tension in the other cables though. There, I've managed to make that seem twenty times more complicated that it actually is!