Greetings! This is a tiny, functional cryptex with a small 3mm diameter chamber on the inside for storing very tiny secret stuff (maybe a secret note!). 

The rings' seams should be random so that they do not give away the location of the gap. You will need to find a way to put lettering on the rings such as paint or stickers.  After attaching all the rings to the shaft, add a small amount of super glue to the stopper and attach it to the shaft. Make sure that the super glue does not impede movement of any of the rings.