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If you look at an official corporate technical sheet for a modern mechanical caliber, you will find columns of highly reassuring figures. You will see the power reserve listed down to the hour. You will see the frequency stated in precise vibrations per hour. You might even see a guaranteed daily rate accuracy, decorated with Swiss certification stamps. But you will never see a single mention of the two measurements that actually dictate whether that watch will run for five decades or grind itself into metallic paste within five years: endshake and sideshake. The brands treat these dimensions like state secrets. They want you to believe that modern automated robotic assembly lines produce absolute, uniform perfection—that every plate, bridge, and gear wheel drops into place with divine symmetry. It is a calculated omission. By hiding the actual mechanical clearances of their movements behind the curtain of "allowable factory variances," manufacturers can pass off sloppy, un...