The present invention provides hydroxy-functional esters having at least one terminal acrylate-functional group. The method can prevent the spheroidized fading velocity of the spheroidal graphite iron. The inserter instruments need not be mounted to the anchors or to the anchor extensions, and are operable independently thereof to position the connecting element into the patient along a minimally invasive insertion path from a location remote from the anchor extensions. The distribution auger includes a tubular auger housing having an entrance for receiving material to be conveyed, a closed end opposite the entrance, and a longitudinally elongated and tapered slot formation through a sidewall of the tubular auger housing, the slot formation having a small width near the entrance to the tubular housing and a wide width near the closed end of the tubular housing. The authentication credentials may be derived from the application-layer credentials using reverse bootstrapping or other key derivation functions. A cylindrically designed circumferential surface is provided on the second connection part.