Changing Combination On A Sargent & Greenleaf 8500 Manipulation Proof Safe Lock

Designed for the most demanding, high-security applications and based on S&G’s original MP Manipulation Proof® locks, 8500 series Group 1 and 1R mechanical combination locks provide superior durability and long-lasting performance.
With three combination wheels, our Group 1 combination locks offer over 1 million possible combinations to deter combination hacking attempt.

[@sjsmith801]

I have a safe with this lock on it. The door is open, but locked and I can't remember the combination. I have access to the back of the lock since the door is open. What can I do to recover or reset the combination?

[@warrensteel9954]

Thanks. I've been wanting to reprogram mine for some time now.😄

[@CertifiedSafesIreland]

Happy to help!

[@rochseguin6749]

Is the a way to changing the combination with you have lost the original combination but you have access to the wheels (ie the draw was left open)

[@CertifiedSafesIreland]

No, this is just regular programming

[@jaxrules2892]

People have found ways to manipulate these so-called “manipulation-proof” locks.

[@CertifiedSafesIreland]

Got a link?