The issue is the female jack socket, which is very crackly and I think needs replaced. Unfortunately it seems to be glued in place. The body of the headphones is wood - what's the best way to get it free?
Yep! All conducting fine.
Thanks for the reply. I just tried some contact cleaner and it does seem a little better, but definitely still crackly, and losing connection at certain angles. I'll try the acetone, carefully. Cheers!