Pre stretching cable/ Prop differences
Steve, believe me your pull pull rudder cables (maybe 3 ft long ) will not stretch enough to need one click of rudder adjustment on your tx. These cables do get sloppy sometimes but its for reasons other than stretch. And what about the other side of the puzzle? If, and I say if, you can stretch this cable what happens later? Does it at some time revert to it's old length and shorten?
Remember when duck fly upside down he have quack up.