Cylinder - (4/6) Huzzle Puzzle

As the name implies, there is a hidden trick inside the cylinder puzzle. There is absolutely no hint or clue on how to start from the outside appearance. If there is one hint that we can provide, it is to go about it as if you were cracking open a safe. Enjoy finding the solution while pretending to be a spy cracking open a safe with a shaken not stirred martini by your side. The theme is "lock". Designed by Vesa Timonen from Finland.

Difficulty: 4/6