Spring Mechanism Test

A retractable ballpoint pen lay angled across a paper pad. I positioned my boot against the grooved barrel to stabilize its roll, then gripped the top clicker with both fists. Aligning my center of gravity directly overhead, I drove downward until the internal coil compressed and locked with a sharp metallic snap. The tungsten tip deployed instantly onto the paper. When I depressed the release collar, the spring recoil kicked back, shifting my balance backward by two centimeters before I re-anchored my stance. Simple engineering, reliable kinetic feedback.