Move your Sentry safe to an area where you can comfortably work, if possible. Insert the key into the safe and turn to unlock. Pull up on the combination handle and hold firmly in place for the rest of the steps.
Turn the combination dial slowly to the right until it clicks on a number. Move the dial two more numbers to the right. Write this number down.
Turn the combination dial to the left until the dial stops. Write this number down.
Turn the combination dial to the right until the lock disengages. The handle will pull up even more and the door will open. Make note of this final number.