Yep Farmer is rite I have a HM -45 all I could afford 15 years ago i think it's slides and slide ways are not that accurate at all the head weight is a heap and there is really no scope to play with . I did ponder on a conversion for a short while then thought lineal slides added up subtracted the pain and thought no not for me ,I have seen some great builds but they threw a truck load of dollars at them .I always liked the look of a 5 th axis old man dreams i guess I wish you luck on the build .