Large roller with impulse pin (roller mounted with roller jewel)

The large roller with impulse pin mounted on the balance staff or on the balance rim and the mainspring is the central element of the regulating device in the mechanical clockwork. In order to achieve a high clock accuracy, the large roller with impulse pin must be manufactured with a very high degree of symmetry. All large rollers with impulse pin produced by FELLER SA are manufactured highly symmetrically.