This is what the threaded rod on the Z axis looks like when I spin it. Not sure if this acceptable or not for attaching the spindle carriage. It looks like it may be corrected when the rod is threaded in to the nut on the carriage but I really do not want to mess up the nut or the rod. I think I may take the rod out and see if I can get it to run straight.
I had to put the rest of the z axis together before tightening the coupler between the stepper and threaded rod. Note that the coupler is not square. It acts like a spring in some ways so you want to make sure that the threaded rod, top bearing and lead nut turn smoothly before tightening up either end of the coupler. The coupler has two set screws and both should be loose until the rod turns smoothly.
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