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You could try "Advanced Telescope Making Techniques" by MacIntosh. There are several grinding machines plans given as examples.
I too would recommend the making of a couple of smaller mirrors to get the feel of how things "blend" when using a machine. I used to remove the arm from my machine and finish off the polishing by hand on the rotating table. You will have to learn a bit about sub-diameter laps as a 20" pitch lap is not the easiest to lift and push around. See Sachmo's comments and take it from those who have "been there and done that" many times over.
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