Step 2: Make Actuator Arm
The rotational motion exerted at the bottom of a glue stick causes the glue to travel up a spiral rod and out the end of the cap. We are replacing the glue with a brass tube to make it sturdy enough to handle all that pet food.
1. Hot glue the tube into the small plastic cup from inside the glue stick. The hollow tube will fit neatly around the inner corkscrew of the glue stick.
2. Make four notches in the handle of the glue stick and fit them over the servo horn. Use hot glue to secure the connection. It is important to make sure the glue dries while the servo and glue stick are perfectly aligned. This will prevent wobbling.