A method for positioning a decoration (20, 21) into a cell (50, 60) of a mold (5, 6), comprising the following steps: - providing a strip of decorations including a series of decorations alongside one another, - winding the strip of decorations (20, 21) around at least part of the piston (16, 3), the piston to that end being situated above said cell in a high position, and more specifically in a cavity (12, 14) of a conformator such that a space is arranged for the strip of decorations between an inner wall of the cavity and an outer wall of the piston, the cavity emerging on a side wall of the conformator by an opening and the cavity further being equipped with a rebound leaf fastened on the conformator, rebound leaf with which a leaf is associated provided with an opening, the strip of decorations to that end being brought, using driving rollers, into the immediate vicinity of the side wall of the conformator, rollers with which guides are associated that force the strip of decorations to pass through the opening made in the leaf and the through opening of the cavity to be inserted into the space, - cutting the strip of decorations to individualize a decoration using the strip that is able to move in a direction parallel to the contact plane between the rebound leaf and the conformator and perpendicular to a longitudinal axis of the piston, - activating means (161, 162; 311, 312, 313) for keeping the decoration on the piston, - introducing the piston and the decoration into a cell (50, 60) of the mold (5, 6), by translating the piston along its longitudinal axis to a low position, - activating means (51, 61) at the cell (5, 6) to ensure that the decoration (20, 21) is kept in the mold and to deactivate the means for keeping the decoration on the piston, and - removing the piston from the cell of the mold. - providing a strip of decorations including a series of decorations alongside one another, - winding the strip of decorations (20, 21) around at least part of the piston (16, 3), the piston to that end being situated above said cell in a high position, and more specifically in a cavity (12, 14) of a conformator such that a space is arranged for the strip of decorations between an inner wall of the cavity and an outer wall of the piston, the cavity emerging on a side wall of the conformator by an opening and the cavity further being equipped with a rebound leaf fastened on the conformator, rebound leaf with which a leaf is associated provided with an opening, the strip of decorations to that end being brought, using driving rollers, into the immediate vicinity of the side wall of the conformator, rollers with which guides are associated that force the strip of decorations to pass through the opening made in the leaf and the through opening of the cavity to be inserted into the space, - cutting the strip of decorations to individualize a decoration using the strip that is able to move in a direction parallel to the contact plane between the rebound leaf and the conformator and perpendicular to a longitudinal axis of the piston, - activating means (161, 162; 311, 312, 313) for keeping the decoration on the piston, - introducing the piston and the decoration into a cell (50, 60) of the mold (5, 6), by translating the piston along its longitudinal axis to a low position, - activating means (51, 61) at the cell (5, 6) to ensure that the decoration (20, 21) is kept in the mold and to deactivate the means for keeping the decoration on the piston, and - removing the piston from the cell of the mold.