In fairness gluing a plastic spacer to the caster block would be better than a drill hole and screw in the actual steering block. The screw makes a weak point where as the glued on spacer should stay put if glued right (not trying to make you suck eggs but scuff the face of the spacer and the caster block and use a thick setting superglue...it wont ever come off)
I checked mine last night, mine also pulls up to the caster block and i have had to back out of some end point to stop the servo straining when doing this. I would check your end points mate or your overall steering balance.
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