I got an AKG K121 Studio headphone for repair in the following condition:
I don’t know what would happened with them. I think it just simply come apart during years. Since AKG headphones are Made in China plastic parts are broke, cable became stiff etc.. I never seen Made in Austria version come apart or with broken plastic parts.
1. I resoldered Right side cables and screwed a piece home:
2. Left side same as another:
3. Elastic bands are also worn out so I removed it and replaced with DIY rubber material. Looks like almost an original part:
4. Finally headphones working again: