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I could put the wolf tooth back on but 42T does work with the new ultegra mechs without it.
It's just the angle that the b screw is at when fully in means it misses the bit that it needs to push on.
One workaround that I might do is put the screw in the other way round which would probably work, as the head is wider than the tip. Just wondered what those who have it working do.
frank9755
11-42 with a standard Ultegra mech is stretching it. A Wolf Tooth Goat Link will give you a fighting chance of making it work.