I posted this in the DT 880 thread, but I feel like it’s relevant for the other DT “Edition” Beyerdynamics.
Would anyone with an “Edition” version of DT 770/880/990 be willing to open the headband and snap a few pics? The slider mechanisms on my set are loose, but since it’s the “Edition” version the plastic enclosure is different. When I opened the band, there were two plastic pieces (one on each side) that fell out. I think these two pieces are key to keeping the slider stable and firm. Here are some pics of my set: https://imgur.com/a/dY7JkI1