You are welcome. The 1968 FSM says the torque on the upper bearing 12 sided nut is 15 oz. in. with the shaft centered. Then they say this can be achieved by mounting a steering wheel, attaching an ounce spring scale to a spoke 5" from the center, and obtaining a reading of 3 ounces. Yikes! I have none of those. I have inch and foot pounds torque wrenches, not ounces. What I did was to adjust the bearings by feel, like on bicycle wheel bearings. Some call it the 'Goldilocks' method. Not tight, not loose, but 'just right'. You want it to feel like a normal steering wheel feels. No slop, but no drag. As for the adapter, those upper shaft threads are so deep I see no problem shaving most of them down. I used a Pontiac Formula steering wheel, so the horn parts fit no problem. Luckily, they offered the Formula wheel on the 1969 Trans Am so it had to work with the 1967-69 steering columns and horns. I used to have a Grant steering wheel and it used an adapter for the horn too. Check and see if the Grant parts will work with the Billet wheel. The horn wire would go up through a hollow plastic shaft where the button would normally go.