I have a couple of questions about running double blades. I have seen several threads pertaining to this, but no one really descibes how they go together. Do you just place the blades 90 degrees to one another and bolt them together, or does something seperate them like a washer? How do the blades keep from spinning around one another if you hit something? Does running double blades cause any problems with added wear on the spindles? Does running doubles cause any problem for the warranty? Thanks in advance.