The compensated nut isn't anything new. In fact my.Enco 110-2034 has one stock. It just gives you the ability adjust tension on the threads as the nut wears and compensate for ensuing backlash. Here is one type of example-I’d like to see how your split nut works out . Looked back and saved a picture of a section of old cross feed screw . The extra length of new rod stock I make an imperial cross feed for my Chineses bench lathe .