My Alpha 1 Gen 1 propeller has some special nut on the back. Has a domed plastic cap that I popped off with a screwdriver, then there is this cylinder that is held on by the nut. (makes it so you cant get a tool on it from the side) The nut is not a hex nut. More like a nut that needs a special socket. I can take a picture but I figured you guys would know what Im talking about. How do I remove it? Thanks!