Abstract: The invention relates to a mechanically-collapsible core device includes a central pin having a plurality of engaging members, a plurality of first collapsible core members each having an engaging member that engages with a respective engaging member of the central pin, a base member having a plurality of engaging members, and a plurality of second collapsible core members each having an engaging member that engages with a respective engaging member of the base member. The pin is retracted from a home position, thereby causing the first core members to collapse inward. The base member is then retracted, thereby causing the second core members to translate inward and linearly. The result is that the core device collapses inward in size so as to permit the device to be removed from the inside of a molded article.