Broken headphone arm

This joint in my headphone arm came apart. When I lifted its upholstery to check, I see that the plastic attachment has cracked. White washer in the bottom is supposed to sit at the joint providing traction.

How do in fix it so it is still useable in public?

My initial thought was to slide the washer in, superglue the joint around it, slide down the upholstery and add extra strength with a zip tie. But I’m hoping someone might have a better idea.

This joint in my headphone arm came apart. When I lifted its upholstery to check, I see that the plastic attachment has cracked. White washer in the bottom is supposed to sit at the joint providing traction.

How do in fix it so it is still useable in public?

My initial thought was to slide the washer in, superglue the joint around it, slide down the upholstery and add extra strength with a zip tie. But I’m hoping someone might have a better idea.