Do they need to be done annually?
What I noticed on my safe with a mechanical lock was this.
Over the course of many years, it appeared to me the numbers were changing a little bit.
Basically the combination got sloppy.
At the end of the combination it use to stop at 90, as time went on that number went down.
One day I had a difficult time getting in, almost like each number changed a tad.
I called SafeCracka and he recommended I not close it and order an electronic replacement.
I switched it out and have been ok since.
