iPhone Duo Teardown Points to a Thinner Middle Hinge Link

YouTuber CuriousHagi's teardown of the iPhone Duo points to the hinge as the failure point behind its reproduced screen crack. The broken part was a middle link, thinner than the links above and below it, that snapped at a small notch at its weakest point. User reports describe cracks in the same place after the hinge catches audibly.