the hingelines on my Aeroworks 35% 260's elevators are slightly off, placing one elevator half slightly higher than the other. To most, this is probably never even looked at. Then, to top it all off, I misdrilled the control horn by about 1/8" on one elevator half. Both control horns' fulcrum is directly over the hingeline still, but one is 1/8" outboard compared to the other. It doesn't seem like a big deal, but, like Mglavin said, no amount of additional mechanical tinkering or servo programming will ever fix it, not even a Hitec servo programmer. The other thing I noticed (I use the two rods coming to a point behind the rudder trick, too) is that, while I can adjust my ATV's to achieve the exact same throws for a given rate, they still don't move at the exact same rate all the way up to their endpoints[:@]. Besides the obvious geometry problems one can encounter, other factors, such as variences in the servo or servo arms themselves, or a little extra friction in the hinging of one control surface or ball joints campaired to the other, can also reek havok. The best thing to do is to get rich and get sponsored. That way, you can afford a pro-build instead of the chinese stuff, and can have buckets of servos lying around so you can mix and match them to get exactly what you want!