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Hi everyone. I'm a hobbyist. I just got my first safe and would like to learn how to change the combination. It is a Cole-Steel file cabinet with 3 drawers on the left and a locking door on the right with the safe behind. I have the original combination. I have no change key, if needed. I can't find a procedure anywhere for this brand lock. It is a 3 cylinder lock. That's what I know. What am I missin g to change the combo?

remove the 2 screws to expose the tiny wheelpack. these locks are hand change. just move 'fly' of drive wheel to a different hole and reassemble. also, the dial may be attached by a square spindle. just move spindle to different position (of 4 possible).
https://imgur.com/um7F2Km
EDIT: move 'fly' on top wheel in wheelpack. Disregard 'drive wheel' comment.
http://imgur.com/a/P8Lwz

Call me an amateur or just cautious. The locking mechanism is covered by steel. The whole backside of the door it. I'm not sure if it comes off.

Ok so I got the combo changed, but I'm not quite sure what happened. There were 2 wheels that could be changed. I changed them. Now I have a new combo but the numbers are not matched to the numbers on the wheels in the wheel pack. Plus what about the third number? Not only did it change, but it had no wheel. What gives?