Originally Posted by Nitrah
in this case adding a shim won't help. The screw head is tapered, so thicker on one side and I need it farther in to enable the top lever to clear it. If I back it out part of the screw head sits up proud.

If the screw is turning too far, which is almost always the issue, a shim will help. You may have to try a couple different thicknesses, but something should return it to original spec.