I'm not going to pretend that they are all easy, but it shouldn't be that hard.
The biggest thing I see wrong here was way too big of a hammer. The idea is to be able to hit it with some speed (repitition) which you can't do with a 3 foot sledge. You need to repeatedly beat it, hitting about the same spot every time. You will hear the sound change....that is at least one cone loosening. Next take a screwdriver and tap it into the slot of the cone, this will expand it slightly. You can then either slide it up or unscrew it like a nut.
You may have to modify a screwdriver to fit the slot w/o hitting the stud by grinding on the point a bit.
Heat is not necessarily a help here either. As everything heats it expands....making it all tighter. This is such a solid mass of metal that it would be nearly impossible to heat the arm and expect it to not transfer to everything else..........as evidenced by killing the ball-joint.
Steady repetitive shock..........not a huge blow
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