how to tighten loose lock on ouroboros bracelet from COPPERTIST.WU?

Coppertist.wu designed this distinctive brass bracelet using Ouroboros as a reference, and hand carved the vivid outline of every scale, giving it a nice texture and more realistic look. So the first thing we understand is that ouroboros bracelet is a handicraft, the material can't be as hard as a machine-produced product. After using it for a while, you will find that the lock on the chain will be loose and not so tight，don't worry, we will teach you how to tighten loose lock on ouroboros bracelet. 

First: please adhere to the correct use method, otherwise there will be no way to solve it later. 

Due to the special internal structure of this bracelet, please press down on the end of the tail to open it. Do not pull it open directly as this can easily lead to damage to the internal structure of the bracelet.

Second, you can refer to the following video to adjust the bracelet, the steps and analysis are very clear.