I want to put the smaller alum. or brass spinner nut on to replace the large plastic spinner. They have a hole and what looks to be flats on the back. I'm guessing you can use a wrench on the flats, or anything small enough to go through the hole to tighten the spinner.

My question is:
What is the proper prop position before tightening (or does it matter), and what keeps the starter from loosening the spinner?