Patent ID: 8147127

Claim:
A method for making a balance-wheel-and-spring assembly for a horological movement, in which: one spring ( 10 ) out of a series of springs is paired with a balance wheel ( 20 ), the spring ( 10 ) having characteristics that vary by comparison with other springs of the series, and the spring ( 10 ) being designed to be mounted on the staff ( 16 ) of the balance wheel ( 10 ) via a collet ( 30 ); and one collet is selected from a set ( 40 ) of collets of different sizes ( 30 A, 30 B, 30 C) based on the spring's characteristics, collets of different sizes having connection points ( 32 A, 32 B, 32 C) for attachment of the spring ( 20 ) that are located at different distances from the center of the staff ( 16 ) of the balance wheel ( 10 ) after assembly, the choice of the collet of the most appropriate size facilitating the adjustment of the balance-wheel-and-spring assembly.