Tom,
You can't go a full turn, the point there is that the screws usually only sit flush with the metal in one orientation as that is how they were originally regulated. You said your screws were only off a half a degree which I would guess is not quite accurate as most people could not see one half degree. The point is a thin spacer under the screw head could be a quick, cosmetic fix for a minor adjustment where as adding material to the under side of the screw head via welding and reregulating would be a more appropriate, permanent fix.
Thanks Brian,
Clear and to the point.
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