MadMax, I took the opportunity to measure up the gibb the last time I had the head assembly off. Somewhere I've got a SolidWorks model of it. As standard the adjustment wasn't enough to stop the head from lifting under for example spot drilling. It was actually difficult to tell anything was wrong from a static condition, but under a run condition it was possible to see the movement.
I decided to mill the lower notch in the gibb to allow it travel further. I had to put a spacer on the top screw to allow it to keep pressure on the top of the gibb as it would just bottom out on the thread travel. It is a lot better than it was, but it's obviously not as good as it should be. |