The gib adjustment of my G0602 compound has never been satisfactory, countless adjustments left it tight and still allowed too much vertical movement. I noticed the the gib itself would rock on the upper casting due to a hump in the middle of the upper section, I was attempting to hold the gib "up" on both ends during my adjustments to eliminate the movement. After some careful grinding the gib would now lay in the upper casting with no movement, I re-installed the unit, lightly shimming the gib upward at each end during adjustment. The compound is now rock solid, with almost no movement vertically. Movement effort is reasonable, and parting is now easy, even with a large tool overhang for a large diameter solid. I had already performed the addition of bolts as recommended on the Projects in Metal site, which had helped, but not nearly as much as this. Good luck.