I had a hard time drawing this, and I see a couple of things that could be changed. But, I just used those post-hole diggers to dig 7 holes, each 2-1/2 feet deep, for my new fence I'm building across the back yard.
My had was so shaky from the unusual strain on the muscles, that I could hardly keep the pen point on the paper. So, this looks good enough, to me.
Hope you agree.