Some helpful Notes.
When turning the key in the lock it must be done with precision and slowly. On some worn locks, you may have to turn the key slightly past the central upright position.
If you listen closely you should be able to hear the switches clicking inside the lock.
Sometimes you need to add one digit to the second and fourth digits of the EKA code, as the MGR database has sometimes not been accurate
For entering accuracy, it's quite useul to nudge the key ever so slightly past the centre mark, to ensure that the lock has registered a zero point