If you check my thread "IR injection maintenance" a couple threads down, you can see how mine is set up (not the greatest pic), and others have drawn up a few different combinations.
I've seen another cool setup that had a wheel that mounted in between the stacks, that the cable went to, and the rods that actuated the butterflies came off of the wheel.
This I think could be made to be very progressive.
Here's a link to the thread with the pic of the linkage system I described. it looks very cool too.
http://pantera.infopop.cc/eve/...0045562/m/4121066556
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