Allen- You got it, less pressure at the pushrod end. How do I attach the wire to the horn? I put a ~1/2' length of 1/8" sq. brass tubing on the 3/32 horn wire and solder it well with Stabrite solder. I drill a 1/8"hole in the horn and file it out square and a tight fit and Stabrite that joint too. Works for me, I know others will frown on such method but this way I can make all my own control parts exactly the way I want them, including my bellcranks.
Actually Don, I think that' a great method if you must use brass. Jim Hoffman from Phoenix used to make horns simisar to the for big airplanes. Worked very well and no failures. It does seem a little labor intensive though!