The ball links I used are Du-bro #369. They are a 2-56 ball link for a 4-40 rod . The bolt that holds the ball is 2-56, but the plastic part threads onto a 4-40 rod. You still have to drill the hole out slightly to get the 2-56 through, but it isn't much. I also added a 2-56 washer on the top of each ball link to ensure that it is captive even if it popped off of the ball. The washer limits the range of motion slightly, but things line up well enough that there is no binding. After assembly and getting the pushrod length finalized, I tighten them down hard and apply GREEN LOCTITE. It's very thin and is designed to wick into pre-assembled fasteners.

The pushrods are from central hobbies.

www.centralhobbies.com

The titanium 4-40 ends are glued into the 3/16" OD carbon fiber tubes with JB Weld. I ordered the pushrod kit (2 rods, 4 ends) and 4 extra ends to do the ailerons and elevators. The kit comes with 2, 24" CF rods of which I used a total of about 6 inches of one of them.

Richard
Tomball, TX