Disclosed is an assembly to equip a timepiece mechanism and including at least one elastic element and at least first and second timepiece components, the elastic element cooperating with the first and second timepiece components and the elastic element, in the rest position, urging the first and second components to displace one of the timepiece components relative to the other. The elastic element includes a first end cooperating with the first component, the first component and the first end of the elastic element being shaped so, in the service position, the torque exerted by the elastic element on the first component and the second component maintains the first end of the elastic element in abutment on the first component at at least three distinct first bearing points that eliminate at least two degrees of freedom of movement between the first end of the elastic element and the first component.

The invention relates to a method (19, 19, 39, 39, 59, 59) of assembling a part (5, 5, 25, 25, 45, 45) in the aperture (18, 18, 38, 38, 58, 58) of a component (3, 3, 23, 23, 43, 43). According to the invention, the assembly system (19, 19, 39, 39, 59, 59) includes a system (1, 1, 21, 21, 41, 41) of securing the component (3, 3, 23, 23, 43, 43) and the part (5, 5, 25, 25, 45, 45) to each other, which includes at least one pawl device (11, 11, 31, 31, 51, 51) intended to make the component (3, 3, 23, 23, 43, 43) and the part (5, 5, 25, 25, 45, 45) move integrally with each other. The invention concerns the field of timepieces.