Just a simple building tip. I use sullivan metal clevis on the non-threaded end of the push rod, after I thread either 4-40 or 2-56 thread on the rod and then solder it on firmly. I then use great planes, locking clevises on the adjustable end. Never had a connection come off, since both ends have locking clips on the pivot pin end. Now let's throw out those cheap ARF control horns and get some really good ones for a couple of bucks and make the system really reliable. Be sure and inspect the locks before every flying day, on your fist pre-flight check, then you can worry about switch failure, or battery failure or . . . .