Abstract: An I/O endforming tool for forming an end of a tube, the tool having a cone ring expandable and contractable conical I/O jaw assembly, a barrel assembly, a plurality of I/O fingers and mandrel assembly, wherein the I/O jaw assembly has a plurality of conical jaw segments, one segment adjacent two neighbouring segments, each segment having a recess within each of its sides adjacent each neighbouring segment and biasing member retained within each recess to effect a biasing effect between adjacent jaw segments the improvement wherein each recess formed at a portion of the outer circumference of each segment as to define a radial trough when the jaw assembly is in its expanded position; and the biasing member is a solid, non-metallic deformable member retained within a circumferential recess defined by a pair of adjacent the troughs when the jaw assembly is in its contracted position. The process of manufacture provides improved saving in time, handling, efficiency, consistency and quality.