One thing I note with counterbalancing.
Originally my SX3 had 60KG strut and 45KG head.
This meant it was bouncing around on the strut, and the screw was pulling it down, and erratic.
Since I replace it with a (longer) 40KG one, it is very repeatable now.
Like having a trailer on your car with the load too far to the back.
The car bounces all over the place.
http://www.cnczone.com/forums/syil_p...trut_x3_-.html
Super X3. 3600rpm. Sheridan 6"x24" Lathe + more. Three ways to fix things: The right way, the other way, and maybe your way, which is possibly a faster wrong way.