ORIGINAL: ChuckAuger
Slide a few pieces of inner Ny-Rod..maybe 1/4" long pieces...on the wire every few inches, and run this inside the outer Ny-Rod. Then tie wrap (or even black tape will work) this to the boom.
Works well for me, but I'll bet there are some more ways to do it.
That is how I did mine, however I ran the ny-rod inter tube all the way down the boom with a steel rod on the inside. The first one I did, I used ny-rod inter and outer all the way, however the G forces would flex the inter ny-rod.
I saw a Stick it with smaller servos, like 225's, mounted on the tail. The guy balanced the bird with a 40 instead of a 32.