A mask blank glass substrate is for use in manufacturing a mask blank. The chassis carries an image sensor device for sensing an image, a processor for processing the sensed image, a pagewidth print head for printing the sensed image, an ink supply arrangement for supplying ink to the print head and a supply of print media onto which the sensed image is printed. The detergent dispensing mechanism is fastened to the periphery of the barrel and is contiguous to the handle.