I haven't played around much with rod-type guides, but here's some thoughts...
If vertical deflection is the only concern, (bows under weight of machine), you could arrange some bolts as setscrews. Depending on the clearance your linear bearings have for supports, you could grind a depression in the head of the screws that has the same radius (or close) as the rod and then use two nuts on either side of a bracket to adjust the height. |