Got more complete working headphones to digup too if wanted?
Used in my own diy headphones that i used in my teenage years. Kept fairly clean. Was built into some nice HL folding ear defenders but needed them back as ear defenders now. Half decent sound from these but original frame was quite poor. Main thing with diy is making sure left and right is same distance is same, else one ear gets more db exposer than other! Built diy originally for better outside sound isolation.