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Used to be a way (on the old, old Shimano derailleurs) to adjust the spring tension. IIRC, it was done at the pivot (just above/11 o'clock from the 'A' in Altus). Of course this was ~40 years ago; design -- and my recall -- might be just a little off.
Regardless, if that's the original chain it's likely stretched more than you'd like; if it's original I'd just replace it.
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Dale
1985 Carrera 3.2 -- SOLD
2026 Jaguar F-Pace / 2025 Ford Bronco Sport
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