Initial semaphore control bracket



Updated bracket



Final semaphore control bracket



This manufactured arm reduces the vertical travel of the servo horn, connected on the left, 2:1 to match the needed travel of the semaphore control wire, connected on the right. The 1/4" hole in the middle swivels over the post.

Diagram of servo lever






The post is manufactured from a 3/8" hex bar to support the arm. The small end is threaded and passes through the bracket secured with a #4-40 locking nut.


Post for semaphore arm


The horn that comes with the servo is modified to accept an E-Z connector. The horn fits on the servo's knurled shaft and is connected to the long end of the arm above, with a "push-rod" using E-Z connectors.


Servo horn with added 1/16" hole