The Sx2p table has anti backlash nuts which are made of cast iron with a longitudinal slit, and an adjusting screw to take up the backlash. The threads are trapezoidal IIRC, and there is a common technique to make delrin nuts by heat moulding the material around the screw, so you could perhaps do your own. The advantages of ball screws are low backlash, near zero if you use double nuts, and low friction, I'd recommend them if possible. A good strategy would be to try the standard nuts and adjust the backlash as small as possible, try delrin if that isn't satisfactory, and ultimately if you need to, upgrade to ballscrews.

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