frame is perfectly square. right side lead screw is very easy to turn. left side binds and is hard to turn. removed lead screw nut and it becomes free (both sides move with same force) once i put lead screw nut back on it seems to feel ok but once it moves a little bit it bins up again. removed the lead screw and this is what i see. it appears the lead screw is off center and when the nut is put on it pulls it even more and binds. was thinking about filing the cone some to open the hole? also loosened the x-axis on that side to see if that would release some tension and allow it to move back to center but didnt work.