Originally posted by Tetherite
If you mount the control horns such that the attach points for the cables (to the control horns) are 1/8" behind the hinge line, the cables can be tightened equally at neutral and give a firm control.
By doing this you allow the "pulling" cable to be taught and the opposite cable to relax because of the difference in travel between the two provided by the off-set.
FYI. 
Much like some full size aircraft have the attachment points a certain distance behind the hinge line.