That small opening at the bottom of a padlock is much more than a stray manufacturing detail. It exists to keep the internal mechanism alive. Rain, snow, and humid air can seep into the body of a lock, and without a place for that moisture to escape, the metal parts inside would seize up. The tiny channel gives trapped water a way out and also offers a spot where oil can be applied to reach the internal pins. With a few drops of lubricant, a stubborn lock can return to smooth motion instead of being forced open or cut away. Even the most modern weather resistant locks keep this feature because it provides simple, dependable drainage and a small amount of pressure relief. It represents decades of trial, error, and accumulated knowledge in a detail most people never notice.
Once you become aware of things like this, a whole world of quiet design choices begins to appear everywhere. A screwdriver handle often has a square or hexagonal base that a wrench can grip, allowing a person to apply controlled strength when a screw refuses to budge. That extra surface is not decorative. It is a built in reinforcement for moments when human grip alone is not enough.
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