A method comprising attaching a screw head to a bone fixator component, wherein the screw head comprises a first portion comprising a slot and an inwardly curved bottom portion and a second portion comprising an outwardly protruding and expandable bulbous end extending from the inwardly curved bottom portion and wherein the bone fixator component comprises a concave socket adapted to receive the screw head securing the bone fixator component in a bone securing a locking pin in the screw head engaging the locking pin with the bone fixator component inserting a longitudinal member in the screw head and inserting a blocker in the screw head.
