The present invention is directed to compounds, compositions, and methods for halting or reversing the effects of chemoresistance in neoplastic diseases. The contact structure is formed of a contactor carrier and a plurality of contactors. The center error offset injection circuit may be configured to determine a value of the center error signal when a lens in a sled housing is at a mechanical center and generate an offset signal based upon the value. The additional defined flow path also directs more of the product to the valve stem aperture, further increasing dispensing of the product formulation from the container. To attain a very high precision cutting the spacing of the front cut edge formed when the previous piece or section is cut away from the cutting device is measured by means of an image-taking device prior to cutting away of the next piece or section. The method comprises the steps of applying a solution comprising a stain inhibitor to an absorbent strip; transferring solution from the wet strip to the surface of the glass article; and drying the wet glass surface to leave stain inhibitor on the surface of the glass article.