How Is A Combination Lock Made? | How Do They Do It?

Founded by James Sargent in 1857, the Sargent and Greenleaf company is well known as a manufacturer of safes and vaults. But, how exactly do the combination locks that keep intruders at bay work, and how are they made? Subscribe to Discovery UK for more great clips: http://www.youtube.com/subscription_center?add_user=DiscoveryTV Follow Discovery UK on Twitter: http://www.twitter.com/DiscoveryUK