Cracking your old Sentry Safe (without destroying it)

A friend of me lost the combination to his safe and asked me to open it. I like a challenge so I gave it a try, with success: an open safe and a retrieved combination. This video describes my approach to open the Sentry Safe by John D. Brush & CO Inc. Rochester, New York U.S.A.

If you lost the combination and you want to get it open again, this video might be the solution to your problem. Thanks to the great comments I recieved I now assume the normal dialing sequence is left-right-left (counterclockwise-clockwise-counterclockwise). In the video I start with right (right-left-right). That works too if you want to crack the code. However if you already have one or more numbers, I recommend you start with left as the first turn (3x), then right (first until 'click'', then to the number, then left to the number. Don't overshooot the numbers; if you do, restart at first turn left (3x), etc. Good luck!

PS: i changed the current combination of this specific safe, so the combination in the video is not valid anymore.