


The Bergeon 16918-TETC has an adapted blade to work specifically with the ETACHRON stud. The nut 'blade' has been shaped to fit over the stud and regulating pins. Turning the stud will change the centering of the balance spring and turning the regulating pins will open or close the pins on the balance spring. The screwdriver and blade are made of stainless steel with a self-lubricating swivel head of synthetic material.