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Enjoy your well-earned beer, Gordon.
A few notes:
Sometimes, the simplest things will get in the way of a proper synch.
Most hex bar linkages have six points that must be nearly frictionless if the throttle plates in both carbs are to return to exactly the same place every time you let off the gas — the four heim joints at either end of both down links, and the two pivot points at either end of the hex bar.
Some Tri-Flow (or your favorite elixir) can be your best friend here. One of the worst things about the hex bar linkage is how much opportunity it provides for friction or imprecision. And those six places can easily get gunked up, thwarting all your other efforts.
One more thing:
It's easy to tell if the bottoms of both down links are starting to move at exactly the same time if you don't try to look at both of them at once. Rest a finger of your left hand very lightly on the bottom of the left side link and look at the bottom of the right side link while you pull the center cable attachment point with your right hand. The two sides should move as one piece. If not, get out the wrenches.
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