You’ll be amazed at the number of manual operations that go into making tweezers.
Note: the video found below will soon be available in English.
Tweezers can be made of different materials depending on what they are used for or what metal they are used for. In the field of adjustment, and manipulation of the balance spring, they will almost always be made of steel. To manipulate bridges they will often be made of nickel silver, brass, or sometimes even with wooden tips. To manipulate batteries they will be made of synthetic material because this material is not conductive.
Another important reason for using tweezers to handle small parts is to avoid getting moisture from the hands-on metal parts that could oxidize. Moreover, the properly trained watchmaker also uses tweezers to handle large metal parts in the field of clock-making, for example.
Knowing how to sharpen your tweezers is often a way to recognize a good watchmaker at the time of his hiring.