Hi, a really dumb noob question here... my P3A arrived this evening. I need to put the propellers on. It says to match propeller nut color with the motor axis colors. Well, the motor axis colors are all silver. And those little stickers on the motors don't help because they all fell off in the box. I do see in a video that it shows 2 axis are black, 2 are silver, but that's not what I have. What's going on? (I'm mainly just curious, as I'm sure I can figure it out without the color by thinking about it carefully. But, this is weird.)