Yeah Norm I do have a method.
Remove nut then I give it a good spray with a rust penetrating stuff,
then put the nut on, level with top of thread ( I'm guessing you know what I mean). now I'll tap the nut with a small sledgy while pulling up on the steering wheel
It is better if someone can help by pulling on both sides of the steering wheel ( Pull from where the outer ring & spars meet... No spline just a Key way, tapered shaft..