Hello, and welcome!
I'm sorry you're having a problem with your old Sentry safe.
If you're sure of the combination, this should be the correct dialing sequence:
First, turn the dial a few times (gently) to the right or the left, to clear it.
A. Start the dial at zero.B. Turn the dial to the left. Make sure ZEROpasses the pointer at least THREE times. Then stopat the first number of your combination.C. Turn the dial to the right. Stop the SECONDtime you reach the second number of yourcombination.D. Turn the dial to the left. Stop the FIRSTtime the pointer reaches the third number of yourcombination.
I hope this helps.
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