I’ve been working on some guides for these headphones for a while now while fixing my own problem with the headband arch coming apart.
I’m not sure if these will help because I’m not quite sure what your problem is, but I’ve taken my guides out of Work In Progress because they’re pretty good at this point, but they are missing images for the meantime (I would like to finish all the images in the future). If it’s a broken casing problem, then I think they should help :)