Cut the center out of the spinner backplate to accomodate the Hartzel constant speed propeller. I'm not really sure why Van's can make so much of this airplane prefabricated but leave this task up to the builder. It brought back memories of the RV-6 construction. Don't get me wrong, it wasn't particualry difficult it just doesn't fit with the current quality of the kits. I then primed the backplate, support brace and forward plate.