Now I need help guys:
I am assembling the Kangke Laser 2000 ARF right now. The control horns are nice aluminum machined parts--but they aren't perfect. When you drill them through the control surface and then screw on the plastic piece with the hole in it--my pivot point ends up being about 1/8" off the hinge line.

Look at the link that JoeAirPort posted. My rudder control horn looks like the third picture. It's offset from the actual hine line. Do I absolutely need an offset servo horn?

If I do need an offset servo horn, whats the offset in a 3" SWB horn? And, whats the distance between the holes? My control horn holes are 3" apart--so does that mean the servo horn holes have to be exactly 3" apart too?

Thanks