Golden arrow derailleur spring fail 1986

RadNomad

Senior Retro Guru
Hi all, tension spring failed on my otherwise excellent golden arrow RD-A105 derailleur. How would you fix this?

I tried the spring from a 1995 LX derailleur that i just happened to have but doesn’t fit (larger diameter and it’s made from square section wire).

The RD-A105 spring is 14mm long (coiled section without tabs) and 16mm outside diameter, round section wire.

Thx!
 

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