You could always whip up a set of homemade shafts with props. I have a spare set when I redid my Arizona. They were easy to make, I also soldered the prop to the shaft. I figured if it came out it would have to come ALL the way out and I might catch it. The problem with a screwed shaft is you should have a replacement at all times because most people won't have one to lend you. Locktite, pin or solder the end so the prop doesn't come off on a rock, ect...