We put the classic Master Lock 5400 series combo box under the microscope and decoded it step-by-step. No force, no destruction—just technique. This video breaks down how the internal wheels behave, what to feel for, and how a simple decoding method can bypass most common combination lock boxes. If you’re learning lockpicking, physical security, or just want to understand how these mechanisms really work, this one’s for you. ⚠️ For educational and security testing only. Always practice on locks

87K views · 221 reactions | Quick demo of the rear diff lock operating in the new Isuzu MU-X. Full review and vid now live: https://www.carexpert.com.au/car-reviews/2022-isuzu-mu-x-review | Paul Maric | Facebook