RE: Prop Nut tightengin and Brushless motor?
Do you have a "collet type" prop adapter? It looks like a big dremel collet on the back where it slides over the motor shaft. Those can be tricky to get started sometimes, but once you get them to catch, you can tighten them down by holding on to the propeller for leverage. The trick is to get the nut tight enough at first so the prop won't slip. Once you have it to where you can hold a prop blade and tighten the nut, it's smooth sailing, and you can tighten it down as tight as you want.