Using a blender or a food processor, finely chop 1/3 cup semisweet chocolate chips. Transfer ground chocolate to a mixing bowl. Add vanilla wafer crumbs, ground hazelnuts, 2 tablespoons white sugar, and melted butter or margarine. Mix until well combined. Press onto the bottom and up the sides of a 9 inch springform pan. Bake in preheated oven for 15 minutes. Allow to cool.