I seem to have inadvertently dropped into that deep black hole that is called threaded rod ,to use or not to use. My object in starting this cheap build was to have some fun and put my 72 yr old brain in gear again. I already had a design in my head using toothed belts when I stumbled across the part built Rockcliff on ebay, so I decided to stay with the Rockcliff design and see if I could finish it fairly quickly. The next 3-4 week should see it done then onto version 2 with Acme screws, Dumpster anti backlash nuts, 1200mm x 900mm bed, Kress spindle and Artcam Express if I can afford it. I read as much as I can on this site and its American cousin so with the positive help that always seems available here version 2 should be the one