Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
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I know there isn't the classic B-screw adjustment or a fixed stop position for the upper pivot. Look near the lower pivot and see if there's a spring adjustment there. Possibly it uses multiple holes in the cage and you adjust the lower spring that way (common in RDs decades ago).
However the fact that it finds a different balance point, depending on which direction you come to a sprocket from, suggests that it's a friction (dirt, dried grease) issue, more than a spring tension problem.
The balance point is also determined by chain length, but that's trickier because you have 2 chainrings up front, and so are dealing with 2 effective lengths.
An ounce of diagnosis is worth a pound of cure.
“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin
“One accurate measurement is worth a thousand expert opinions”
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