fitting 10 to expand under a tension load although threads 22 are shown extending along tapered end 21 the threads are not required along this section of screw 20 for example tapered end 21 may includes a smooth machining grooves and or ridges as described above the expansion of fitting 10 creates an interference between the outer diameter of fitting 10 and the inner diameter of shaft 31 this interference provides the axial and torque reactionary load capability the taper of fitting 10 and screw 20 also pulls the screw and shaft into alignment and ensures precision position of screw eliminating post assembly screw straightening in one embodiment the tension load to expand fitting 10 is created by a washer 40 and a retaining screw 50 fig4 illustrates a partial cut away of screw 20 fitting 10 washer 40 and retaining screw 50 screw 20 is positioned within fitting 10 through fixed end 17 retaining screw 50 is threaded into bore 23 through expandable end 18 retaining screw 50 is held at expandable end via washer 40 which of course is optional if the head of retaining screw 50 is large enough to avoid entering hollow core 16 as retaining screw 50 is threaded into bore 23 screw 20 is pulled into hollow core 16 wherein taper 21 engages with taper on inner surface 14 as screw 20 is further pulled into fitting 10 expansions 11 are forced radially outward and in contact with inner surface 14 of shaft.