Hardware failure: Inside the iPhone Duo hinge defect

YouTuber CuriousHagi successfully replicated the failure during stress testing, providing a rare look at the device's internal mechanics. His teardown reveals a highly complex hinge assembly, composed of a central gear flanked by two distinct sets of linking hinges. The breakdown occurs at a specific structural bottleneck: a middle link significantly thinner than its neighbors.

This specific component snaps at a small notch, which serves as a critical point of failure under tension. Further inspection uncovered physical markings where the hinge makes contact with the device's support plate, suggesting that the mechanism catches during the folding process. These scuff marks align with the localized cracks reported by users, pointing to a design flaw in the hinge’s structural integrity rather than user error.