Abstract: A method for making an activatable insert, comprising the steps of locating a carrier having at least one hollow columnar projection in an overmolding tool the at least one hollow columnar projection having an intermediate portion and a free end portion, wherein the intermediate portion and the free end portion each have generally the same perimeter dimension; deforming the at least one hollow columnar projection while it is within the overmolding tool to form a permanently deformed projection such that the free end portion of the permanently deformed projection has a perimeter dimension that exceeds the perimeter dimension of the intermediate portion; and overmolding an activatable material onto the carrier so that the activatable material substantially surrounds the deformed projection, and the deformed projection helps to retain the activatable material on the carrier.