A customer called about a safe that had just stopped working. They had the key but it would only turn so far. They only had one key. The lock contained within this safe is reliable and with the correct tools good to work with. I inspected the key and identified the fault using medical grade optical equipment. This enabled me to open the safe, quickly without damage. The lock was replaced and the customer was given two new keys. Hopefully the safe will continue to work freely for many years to come.
If you’ve only got one key, don’t leave it to chance, get a spare. The cost of a spare key is negligible compared to the cost of a safe opening.