(First check with meta support might be warenty repair)
To repair a broken strap pin on a Meta Quest 3, you'll need to replace the entire strap. The strap pins are not designed to be individually replaced, as they are integrated into the strap assembly. You can purchase a replacement strap from the Meta Store or other retailers and then follow instructions for replacing the strap.
This video shows how to replace the head strap on a Meta Quest 3:
https://www.youtube.com/shorts/ZJGTYwLID7w
Here's a more detailed breakdown:
1. Identify the problem:
Determine if the broken piece is indeed the strap pin itself or part of the strap mechanism. If it's the pin, the whole strap needs replacement.
2. Purchase a replacement strap:
Buy a new strap for the Meta Quest 3. You can find them on the Meta Store or other retailers.
3. Remove the old strap:
Refer to online tutorials or the headset's manual for specific instructions on how to detach the existing strap. This usually involves releasing clips or velcro and carefully sliding the strap out.
4. Attach the new strap:
Follow the instructions included with the new strap to properly align and secure it to the headset.
5. Test the fit:
Once the new strap is installed, test the fit and adjust it to ensure it's comfortable and secure.
You can watch this video to learn how to remove and attach the head strap:
https://www.youtube.com/watch?v=wkmpa-Zh_h0&t=14
Here you might find parts good luck.
https://www.google.com/search?q=meta+quest+3+replacement+parts&sourceid=chrome-mobile&ie=UTF-8