Safebox with classic numeric code

There is new and improved versions of this mechanism here:
https://www.thingiverse.com/thing:5853561
https://www.thingiverse.com/thing:5888898

This is a simple design of a safebox with numerically secured mechanical system. The assembly can be verified in the attached images.

Important: do not use glue to mount the markers on the disks at first. Mount the whole system on the vault door and perform the unlocking tests with the vault OPEN.

After you assemble the mechanism on the door, take time to understand how this kind of safe works. When you turn the external knob clockwise, it rotates the disk fixed on the shaft at the opposite extremity, inside the box. This disk turns and pushes, through the markers, the second disk. The second disk pushes the third disk, and the third disk pushes the fourth disk. When the indentation on the fourth disk aligns with the latch, stop the movement and take note of the number aligned on the dial with the arrow. This is your first combination