The plans call for the aileron trim springs to be connected to the servo arm by short lengths of 0.041" safety wire. I'm sure this solution works just fine, but I felt like doing something a little extra here. So, I made these little clevis links out of RC model airplane parts. They each consist of a piece of 2-56 steel pushrod material with a Sullivan clevis threaded onto one end and a Z-bend formed in the other.
Personal aside – when I was a kid, building balsa models, I used to dream of the day when I'd be so rich I could afford to spend fifteen dollars on a special tool for making perfect Z-bends, instead of making sloppy ones by hand with a needle nose pliers. Well, inflation has raised the price of a good pair of Z-bend pliers to $18.99, but in the scheme of things that doesn't seem like a whole lot of money anymore so I bought a pair just to have around for things like this.
Here they are installed in the airplane, with the servo arm in the neutral position. You can just barely make out the little steel clips that keep the clevises from popping open. I may actually come back and solder them permanently shut just to be extra safe.
Even with the servo arm and control sticks at each end of their total range of motion, the springs have a little bit of tension in them. That means they should never go slack and get tangled up on anything. Later on I can thread the clevises in or out later on as needed, although it looks like I got the lengths set pretty much right on the first time.
