The Taig already has an adjustable split nut. It won't eliminate backlash completley, but you can get it pretty low. I had mine around .002" in all axis but I'm sure you could do better with some patience. In order to eliminate it completely you'll need a preloaded double nut system, which will cause a lot of friction on a square thread. You may be better off finding a high quality ballscrew and retrofitting that.