Clamp the nut in your vise the thin way, with one corner of the hex sticking
up. File right into that corner making a round-bottomed groove 5/16"+ wide and
deep enough that when you stick a bolt through the groove it will screw into
one of the tapped holes in your steering wheel. Do the same on the opposite
corner of the nut. When you get it to where the bolts will JUST fit through
the grooves and screw into both holes, you're done filing. Bolts must be the
right length so that you have enough thread engagement not to strip the threads
but not bottoming out. Use flat washers between the bolt heads and the big
nut, and put the nut just to where the end of the steering column is flush with
the surface of the nut. Then when you tighten the bolts up it will pull the
wheel against the column.
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George Downs Bartlesville, Heart of the USA!