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As per the above comments, runout of the pulley shouldn't be an issue, the 0,1 runouts of the chuck could be down to the chuck centering but also shouldn't be much of an issue on a router. I think...

Someone has sold you a pup by convincing you that you need to learn G-Code before you can make things, I was initially under that impression but I subsequently found that for most things it's a "Nice...