An engagement assembly, adapted to securely engage an orifice of an article. The engagement assembly includes a plurality of elongate fingers which are transversely movable relative to each other, each finger having an end flange thereon. The engagement assembly has an insertion position, wherein said fingers are contracted together, such that said flanges are adapted to be inserted through said orifice of said article; and, an engaged position, wherein said fingers are flared outwards relative to said insertion position, such that said flanges are adapted to thereby prevent withdrawal of said assembly from said orifice.