SantaFe66- The is an
expensive nut that will not loosen up, goto
www.mcmaster.com search for (page) 3138 look at the bottom of the page for the Hex Thread-Clamping Locknuts (did I mention they were expensive) but they won't let go. A cheaper version at the top of the page called Hex Steel-Insert Locknuts will also work better than the standard crimped thread nuts which can only be used ONCE.