Gib locking & DRO

[TomG]

You mean the locking screw pushes directly on the angled gib? It's no wonder it moves when tightened. There should be a pin under the screw with an angled end to match the gib, then there is no way the rotating screw can push the gib sideways as it locks. I would not use a ball because that will probably put little dents in the gib where it bears and eventually the problem may return as those dents start overlapping.

Tom