![]() The entire jig is then heat treated and tempered to achieve the correct material properties for a hairspring and set the metal in the appropriate shape. To make the basic hairspring, the thin spring wire is inserted into a mandrel (usually four at a time at 90-degree angles to each other) and carefully wound in a flat jig to completely coil the four strands of wire. Helical hairsprings, also known as cylindrical hairsprings, are made similarly to the process for making a basic hairspring by hand but with one big difference. The mesmerizing cylindrical balance spring and elegant bridge of the Montblanc Tourbillon Cylindrique Geosphè€res Vasco da Gama
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