I have a Dura Ace 7400 derailleur to be fitted soon, a modern derailleur doesn't really work because the screw limiter doesn't stop it from going over the cassette!
I have an Ultegra 6600, 10 speed, and it does work, there is plenty of range in the limit screw on that one. Though who cares as that 7400 is awesome.
@Samuli started
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I have a Dura Ace 7400 derailleur to be fitted soon, a modern derailleur doesn't really work because the screw limiter doesn't stop it from going over the cassette!