ORIGINAL: CGRetired

To make life simpler, Bill, the bottom line is to center the servo, make the attachements with the straightest connection between the servo and the control horns, and then don't try to remove 100% of the slack. It just won't happen.

I use a vinyl coated cevlar cord (see link below). Great stuff, comes in two sizes. I threw away the steel cable stuff, in favor of this cevlar cord. It's strong, but very easy to manipulate and to tie knots with (hey, Coast Guard Retired, remember? ha.. oops) And, if and when it may become frayed, and it can and will happen, it's easy to replace.

http://www.thunderboltrc.com/index.p...roducts_id=580

They make different thicknesses. This one is .038'' but there is.058 I believe and other thicknesses.

Of course, there are the physics of the connections. Use the same conrol horns on both sides, do your best to make sure the control horns are mounted in as close to exactly the same position on the left as on the right (and, of course, vice versa.. ) and then make sure you absolutely center the servo with your transmitter set to exact center with the trim at as close to center as possible.. then make the connections WITH THE SERVO'S ENERGIZED. Use the strength of the servo to insure maintaining centering.

Once done, you will have a well centered and balanced pull-pull rudder installation.

Oh my gosh.. next project.. having a pull-pull elevator AND an pull-pull rudder ( as in the Excelleron 90 installation.. quite a challenge!!)

CGr.