Good fix Jaz. This isn’t a spam link - it shows very clearly how to drill through the two broken pieces with a 1.5mm bit (I think a 1/16” bit would work in the US) and use two of the casing screws to hold the broken pieces together. No glue, thread, or soldering.

All that pressure on such a tiny plastic part - for shame, Sony, for shame. What a terrible design. I bought a replacement swivel part on eBay but once I disassembled the headphones it was clear that unless you cut and splice that wire, and who knows how many tiny little wires it contains, it is for all intents and purposes impossible to remove the broken part and install the new part. That’s when I stumbled across this page. I fixed my headphones by holding the broken side headphones in an aligned, “neutral” position, and by then drilling two tiny holes through the opposing swiveling parts. It was not too hard to maneuver a small hand drill with a very small 1/16” bit coming at the parts from the earphone side. The holes were drilled parallel to the direction of the headband. I then sanded all the faces with a bit of 100 grit sandpaper, slathered 5-minute epoxy on the faces, and ran a few simple stitches through the holes and the walls of the swiveling parts, and pulled/tied them as tightly as I could,...