22. The medical implant assembly of claim 20 , wherein a first smooth aperture being formed in the sleeve substantially transverse to the longitudinal through bore, the sleeve body maintaining the first smooth aperture in alignment with top surfaces of the first pair of opposed upstanding arms of the respective receiver.
22. The medical implant assembly of claim 20 , wherein a first smooth aperture being formed in the sleeve substantially transverse to the longitudinal through bore, the sleeve body maintaining the first smooth aperture in alignment with top surfaces of the first pair of opposed upstanding arms of the respective receiver. 23. The medical implant assembly of claim 22 , wherein the first smooth aperture being sized and shaped for receiving a portion of a cord gripping closure top.