RE: pull pull geometry
JimTrainor and CafeenMan are correct. If the servo arm length doesn't match the control horn length and the pivot point of the control horn is dead on the hinge line, the non pull cable will tighten as the servo travels. Not what you want. If you have a little positive Ackerman then this probably won't be an issue. IMO it's best to try and shoot for the perfect set up, keep the control horn and servo arm the same length and get the pivot point as close to the hinge line as possible without being in front of it. It's also important for the cables to exit the fuse where it's the same width as the servo arm/control horn and not rub on anything at full throw.