Here you can see the lower U-joint installed. On the end nearest the steering box, we locked the set screw in place with the supplied jamb nut, however, for clearance reasons, we had to shorten the set screw securing the U-joint to the collapsible shaft. This meant we couldn't use a jamb nut there. Instead we applied a generous dab of blue Loctite. On the upper U-joint we were able to use jamb nuts on all the set screws.