ORIGINAL: Scott Crownover
I like to make separate pushrods for the throttle lever end, and for the servo arm end, making sure that they are long enough to overlap by about 1 1/2 inches. Then I slip a 2 inch long piece of fuel tubing over the overlap to make a single easily adjusted pushrod (this can be either before or after you hook up the servo end). It makes a tight slip fit, plenty strong enough to hold a length adjustment, and very forgiving in a crash.
Scott
I've seen that method used on a lot of combat planes, especially the ones with breakaway engine mounts. It works good for the smaller engines, but anything over above a .40 with the bigger carbs, servos, and vibration it gets a little iffy. At that point I have seen guys slip wheel collars on instead of, or with the fuel tubing for a little more reisitance.