The ole' prop and spinner slide...
Seems that most of your questions have been answered except how to keep the spinner lined up while tighting the prop. Here's what I do:
Cut 2 disks out of some medium-grit sandpaper about the same size as the prop hub. Glue them together paper to paper so you have two-sided sandpaper. Cut a hole in the center for the crankshaft and put this between the spinner backplate and the prop.
Then tighten the prop nut carefully. Works for me!