Calibrating the Spring Doorstop

I terminated night observation and navigated the eastern perimeter toward the doorway. A coiled steel doorstop projected horizontally from the lower wall frame. I paused. The spiral structure exhibited uniform tension across twelve concentric rings. Extending one gauntlet, I depressed the rubber bumper downward by three millimeters. It flexed under calibrated resistance. Upon release, the spring oscillated along a precise horizontal frequency before returning to neutral axis. The damping rate is optimal. I marked this position as a verified tactile waypoint along the passage.