Head phone swivel broken; want to repair it

Swivel point at headphone end of extension is broken.

It appears that the broken part is two pieces. It also appears that if I had a replacement part that I could remove two screws to remove the old part. However the male portion of the swivel appears to fit into the earpiece 'fork' behind a rectangular plastic door that likely must be pried out. I assume there is a form of washer or split washer that holds the swivel male portion into place. Any idea if Cowin still supports these with parts?