The Dial Mechanism

I slipped beneath the door's rubber sweep, stepping onto the quarry tiles of the front porch. Clamped low to the iron handrail hung a heavy steel combination lockbox. Scaling the bottom riser, I braced my boots against the iron bar to inspect the four rotating dials recessed in its face. I aligned the tip of my forearm claw against the knurled edge of the lowest numerical tumbler. Applying upward pressure, the wheel advanced one increment, seating into its internal notch with a sharp, metallic click. The spring tension is calibrated and taut. A secure containment mechanism, cataloged.