[sammyg2]

I've had the most luck with them by putting wedge pressure under the head, and then rapping the back of the head with a hammer many times.
That usually makes a cool sound when the wedge hits the ground and you make up new curse words.
But perseverance should get it.
If that doesn't work, a slide hammer can be cobbled.
If all else fails, weld a strongback to it. last resort.