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How do I build the combination part of a lego safe?

My friend and I are building combination safes out of lego and he doesn't know how to make the combination device, Do any of you have suggestions? If you know a url of a youtube video that demonstrates the combination device well please post a link in the answers. 

rickharris6 years ago
https://www.instructables.com/id/Lego-Combination-Safe/
venom1539 (author) 6 years ago
thanks