This machine is a modular programmable combo lock. I believe it's the first of its kind. I realized a way to make it better now (since this was made months ago), but I've never got around to building that one... So, I'm just going to stick with this one, even though it's a bit primivite. Since it's modular, the amount of new combinations is limitless (well, it's victim to only Minecraft's 3,000,000 by 3,000,000 block limit :P)! I don't have a tutorial on it, and I'm probably not going to make one, but feel free to check out the world download. You can use this in whatever you'd like, just don't forget to give me credit. Enjoy! :)