RE: Extreme Flight 87" Yak 54 - Build & Fly
With the servo hooked up and centered, slip the arm on so it is at 90 degrees to the servo body. Snug the servo arm retraining screw down, but not tight. Then turn the electrics off. Now rotate the servo arm so the locknut for the pinch bolt is down (away from the cutout), and the hex head is up. Hold the nut with needle nose pliers, and tighten the bolt with a hex wrench. Finish tightening the retaining screw.