Safecracking for Everyone

Locksport enthusiast and game developer Jared Dygart delivers an accessible, step-by-step masterclass on the art and science of mechanical safecracking through non-destructive manipulation [00:01]. Dygart focuses on Underwriters Laboratories (UL) Group 2 safe combination locks—the standard mechanism powering thousands of commercial and residential safes, including models from Sargent & Greenleaf (S&G 6730), La Gard (3330), and Diebold [04:32].

The presentation explains the internal anatomy and physics of a three-wheel Group 2 lock. Dygart details the interaction between the exterior dial, spindle, drive cam, lever, lever nose, fence, and wheel pack [01:40]. He explains the rotational dialing procedure (turning left four times to engage all wheels, right three times for wheel two, left two times for wheel three, and right to drop the lever into the drive cam gate) [09:26]. The core of the talk demonstrates how to read the lock's internal state without seeing inside, using the dial to feel contact points where the lever nose touches the edges of the drive cam cutout [14:27].

Dygart teaches viewers how to plot contact point readings on graph paper across dial increments (typically every 2.5 numbers) to reveal mechanical variations and gate signatures [19:40]. He explains wheel isolation techniques (running high and low tests) to identify which specific wheel is indicating a gate [24:31], and demonstrates rotational tricks to dial individual wheels without disturbing confirmed numbers [29:26]. The session concludes with practical advice on building pointer magnifiers for dial accuracy and analyzing structural differences across lock manufacturers [34:15].

(AI summary — Gemini Flash)