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You can see my spring in the pics at the top of this page, this is mainly used just to keep tension on the linkage when i'm working on it so the pedal side of the linkage doesn't fall down.
They should snap closed on their own with the triumph linkage, if they don't, they may be bound up. Loosen up the bolts that hold the ITBs to the manifold, exercise the ITBs several times, ensure the fuel rail brackets are straight, then tighten the bolts back up. This should eliminate any binding issues and allow them to snap closed easily.
Also, make sure when you're adjusting the ITB linkage that the center pivot is disconnected, start with the hex set screw first to set the first ITB, then the phillips to set the last two, repeat on the other bank, then balance both banks to each other with the hex to set the idle when warm, then attach the center pivot linkage. The linkage rods should be just barely loose with no tension on them at idle.
It takes some fiddling, but you should be able to get a consistent balance
Good luck!
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