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@rodabod
I'm not convinced that derailleur will have the same cable-pull/actuation ratio as a later 8-speed indexed derailleur.
General things to watch out for are:
Dirty or sticky cables,
Overly worn jockey wheel
Lateral play in the main rear derailleur pivot (whole mech rocks side to side if you grab it).
Worn G-springs in shifters (gear change is noticeably sloppy and not "clicky" at all).