1. A BENDING TOOL FOR FORMING AN ELONGATE WORKPIECE COMPRISING: (A) A MANDREL HAVING A LONGITUDINAL AXIS AND A TRANSVERSAL GROOVE FORMED ON THE OUTER SURFACE THEREOF CONFORMING TO THE DESIRED CONFIGURATION OF THE WORKPIECE; (B) A SLEEVE MOUNTED ON THE MANDREL AND MOVABLE OVER THE GROOVE ALONG THE LONGITUDINAL AXIS THEREOF; (C) MEANS FOR MOVING SAID SLEEVE ALONG THE MANDREL; (D) A LEADING EDGE OF THE SLEEVE HAVING AN APEX FOR ENGAGING AN INTERMEDIATE POINT ON THE ELONGATE WORKPIECE, SAID LEADING EDGE HAVING A TAPERED SURFACE ON EACH SIDE OF THE APEX FORMED AT AN ACUTE ANGLE RESPECTIVELY WITH A LONGITUDINAL LINE PASSING THROUGH THE APX, SO THAT THE SLEEVE GRADUALLY ADVANCES OVER THE RESPECTIVE SIDES OF THE WORKPIECE; (E) WHEREBY PLACING THE INTERMEDIATE POINT OF THE WORKPIECE INTO THE MANDREL GROOVE AND FORCING THE SLEEVE OVER THE WORKPIECE WILL GRADUALLY BEND BOTH SIDES OF THE WORKPIECE SIMULTANEOUSLY AROUND THE MANDREL TO CONFORM TO THE CONFIGURATION OF THE GROOVE.