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I use the same principle on posts hammered in the ground without any concrete. Just tie a diagonal lashing (where your metal pin is positioned) about the lever and post, then add a fulcrum and step gently on the lever, once the post is moving, untie and pull out. Like popping teeth. Well done, like the way you handled the awkward post, there's always one.
At last, have ironed out my problems and with mjrovai's help got the sketch into the MEGA via the Codebenders website. A minor bug found, the schematic in the pdf has an error, the signal lead for the base goes to pin 3 and DB4 from the LCD goes to PIN 2 which is correct in the sketch data.
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