But wait! Check out this gallery.

https://imgur.com/gallery/Wz6xO5J

This frame seems to have two of those rivets per side. I'd have to say it did come from the factory now but I don't know why and not all frames have it. This is the first time I've noticed this. My frame definitely doesn't have any of them. I will check my spare frame when I get to work later this morning.

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