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  • could it be the lever itself and not the derailleur? Any ideas?

    It could just as easily be the cable. If the cable housing/liner ends haven't been finished properly, or if there's a kink in either a section of inner cable inside housing or a section of the cable housing, it could exhibit the symptoms you describe. If the bike was posted to you, a cable could easily have got kinked in transit due to poor packing.

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