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Here's a much faster method with nothing to build: Any vehicle, a decent length of rope, and a board (like a 2"x4") will do. See the drawing. I've pulled many posts this way, including deeply set ones. Keep the end of the rope choking the post near vertical throughout the process by moving the vehicle in short strokes and reversing a little each time so you can re-set the position of the leaning board and/or move the rope choke down the post. A chain with a choker hook works great, too.