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.