A method of exposing a surface to be exposed and an attenuated type phase shift mask for use in the method are provided herein. The adjustment knob assembly includes a base block mounted on the archery bow with a base throughbore extending between inner and outer base ends, and an index surface surrounding an outer base aperture leading into the base throughbore. The clad portions each have a periodic structure which exhibits a periodic variation in refractive index in a direction perpendicular to a light propagation direction, and at least one of the periodic structures is inclined with respect to a surface of the substrate so that an interval between the periodic structures is gradually reduced toward the substrate.