I just installed a ball screw (Thomson .750 x .200) to my G0602 to enhance the ELS conversion and eliminate the troublesome half-nuts misalignment and friction. So far it works great; but I am concerned about the .007" backlash, which to me seems excessive. What should be the maximum backlash one could expect, from a new ball screw and ball nut? Both items were purchased for McMasters-Carr. Bob