Last year at Monster plane's, in Lakeland Florida,a pilot had to fly for a little over 45 minute's because he lost his throttle. After running out of fuel and then landing he looked to see what was wrong. His throttle arm had came off the servo. He learned two thing's that day. One, use thread lock on metal geared servo's. Two, leave the spring on. No he did not have an on board kill or on board choke, does now.

Everyone do as they wish, it's your airplane.
I'm done with this thread.
Enjoy!