trying to remove rear axle

[7omly]

It's a bit late now you've done it but here's a tip for the future.
Years ago I had a Jawa 350 and both spindles had a small indent in the thread end so you could belt them with a hammer and a pin punch. Greasing up is the solution but use marine grease as it is more resistant to water. Alternatively take a 3mm drill and drill around 3mm into spindle. Next time it's stuck you can insert an old pin punch into it and batter feck out of it without worrying about thread damage.
All the best