I was surprised it was plastic and not metal...or at least some kind of metal insert.
In any case this is something I can easily fix from my end when i receive the parts.
In the meantime i'm stuck using my Beyer DT990 600ohm....so dissapointing =(
For me to screw it back in correctly i had to make a small incision just enough to fit a small phillips screw driver.
I would have a heart attack if I actually owned this $700 dollar headphone and that happened to me. I'm not the biggest fan of the build quality, of all hifiman headphones.