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I’ll still try adding grease to the threaded rod, but as a first step I tried loosening my anti-backlash nut. At least, I think that’s what I loosened – the one on the bottom of the 5″ bolt in the middle assembly? That seemed to work, and I did a successful carve of a design from Vectorink.com. 😀
P.S. @vicious1 I just noticed you revamped the assembly instructions. They look awesome!