I found a factory tilt column for my 68 after a long search. It is in decent shape but want to rebuild it and restore. I am familiar with the newer ones and how to disassemble but they have a plate and clip holding the unit together and this one has a nut that appears to be 15/16 12 sided and a conventional socket will not fit on it. Does anyone have a idea of where to get this tool? Also an exploded view and disassembly instructions?