need to keep pesky x-rayers and people with too much time away from your stuff? use this over the top combination lock! It's quite hard to work with, so if you're noob with redstone just use it tha way it comes in the schematic.

USING
To activate the lock, enter the right codes (10 levers) and press execute. Do this 5 times, for 5 different codes and the lock is activated. execute one wrong code, or press the reset button and it will reset entirely.
In the schematic there are signs showing the code you have to enter (V means lever down, A means lever up).
The order in wich you enter them makes no difference.

REPROGRAMMING
You have to swap a piece of redstone with a redstone torch and a block on top of that, as shown in the picture. just redstone means the lever has to be up, a torch and block means the lever has to be down.