Details
Here is Micro-Stella (balance regulating ) Ref. 2019 wrench that is used to adjust the rate of a RLX caliber 2130, 3035, 3055, 3135, 3155 (and similar). These precision tools are filled with oil which allows the balance weight to float, providing a great accuracy in reading the graduations located on the index scale. Adjustments can be made either with the movement inside or outside of the watch case.