Hi new to the board. I have 2 gen. 1 phantoms. After having both with the same problem of the nut and the propellers flying off, Today I spent an hour and a half with tech support and sales support. They came out with a new propeller that is 8" and requires no nut to be on top. It took a little bit of persuading but they agreed to send me the new propellers. Hopefully no more crashes!