Abstract: A core pin assembly is provided that includes a core pin insert comprising a core pin body and at least one pin member, and a core pin support defining a passageway for receiving the core pin member. The core pin support, when assembled to the core pin insert, retains the core pin members in desired positions and resists unintended flexing of the core pin members during the molding process. When used to create a lens body, the presence of the core pin support in the mold during the molding process causes formation of a void, or “window,” in the molded lens body. The window of the lens body may be used to advantage in fixing optical fibers to the lens body by applying epoxy within the window directly to the fiber's glass core/cladding, and in close physical proximity to the fibers distal end within the lens body's passageway.