Hi all i received my ball screw kit from Damen cnc last week and got it finally installed today.I set the steps etc and adjusted for any backlash if hardly any.but upon doing a circular test in aluminum at 20mm diameter i am still getting big difference in size 20.24mm in X and 20.29 in Y. i had the same problem with the standard screws which is why i changed as i though they were the issue but it looks more now down to me setting it up.Any advice much appreciated.