3 possible fixes for these awesome sounding headphones !!
1) No glue or soldering iron required : https://youtu.be/DVKypArMB30.
2) soldering iron required : https://youtu.be/PJ1X-CbX29Q.
3) soldering iron and super glue required : https://youtu.be/fnBbyw9bG7k.
Enjoy!!!