Here is something you will need to do to work on a 1967-68 tilt column. There is a thin nylock nut that secures and pre-loads the upper bearings. It is pretty far down the upper shaft and requires a special tool to reach it. They call it the 12 sided nut and it needs the Kent-Moore # J-22599 extra deep socket. Good luck finding that tool. The nut flats are 23mm but the deepest 23mm socket I had would not reach it. I decided to just make my own tool. I took a Craftsman 23mm deep socket and cut it just below the ratchet hole. I then took an old broken 24mm HF impact socket and I welded the 23mm part to the end of the 24mm socket. That worked perfectly and I can reach that nut EZPZ. I painted the tool to hide my Frankenstein welds but it works just great.