Runaway Replacement Headband

I managed to break my bluetooth headphones the other week and didn't want to spring the ~$40 for a new pair. Luckily the only thing that broke was the central headband, so I was able to model a replacement. They're not perfect, but I like them well enough to repair 'em.
The headphones are from: https://www.amazon.com/MEE-audio-Bluetooth-Headphones-Microphone/dp/B0070UKBO8

To assemble you'll need:
2x 20mm M2 Bolts
2x M2 Nuts

The M2 nut traps along the band itself are for bolting a cushio