A molding element has an anchoring portion and a molding portion, the anchoring portion being intended to be anchored in a part of a tire tread mold with the molding portion projecting from a molding face of the tire tread mold part. The molding portion of the molding element has at least two extensions, one of these extensions having at least one arm pivotally mounted on the extension. The molding element is characterized in that, in the molding position, at least one arm pivotally mounted on an extension bears on another extension of the same molding element to define at least one orifice passing through the molding element to mold a connecting bridge between opposite walls of a cutout molded by the molding element.