As with any shiny new tool, he started looking for things to investigate with it, and his gaze fell on a Sentry Safe (produced by Master Lock ... he wrote some Arduino code to send the same ...
Go back to the D1 Combination Lock and put in the Code. Turn the dial in the order drawn to the left of the padlock. Go right and stop at 4, then go left to stop at 37, and then go right again to end ...