I've used a combination padlock for years, but never really understood how it worked until I made this video. The combination padlock I used in this video is from Master Lock, but there are other ...

Explore the intricate mechanism inside a combination lock in this detailed animation. The video is available in over 20 languages; you can change the audio track language in the Settings menu. This ...

Get one of the combination locks and put it on the front door. You can change the combination any time you want; usually, it's just four numbers that you type in, and then the door opens for you. It's ...