I had it running on the slides but thanks to JasonB and his suggestion over on madmodder, I`ve made a simple design to hold the leadscrew nut. It just so happened that I had a few pieces of chunky brass plate lying around from the frames of my clock build so I quickly neatened up a small piece, machined a flat on the top of the nut and silver soldered them together (thanks Drew!) with some screw holes to fasten it to the bottom of the table.