20 months ago I purchased the HD 6xx and the glue that holds the earpad in has melted and no longer holds the pads together releasing the inner foam to expand out from the ring shape around the headset. Can anybody tell me if all editions of the earpad's in this listing also use the same glue style to hold the base together of the fabric which surrounds the encased foam. I understand the sheepskin is stitched together, but does it still use glue to bind it to the bottom of the earpad?