I'm not sure what you are getting at with tightening, but I can help with your question. There is no prop position that keeps the starter from loosening the spinner, however there is a prop position that lessens the chance of breaking a prop on a deadstick and makes it easier to hand prop. When looking at the front of the airplane turn the engine crank counterclockwise until you hit compression. Now tighten your prop so that it sits horizontally.