A mask mark is irradiated by an ultra-violet light source, thereby the image of the mark is passed through a lens and a half-mirror, then reflected by a mirror, thereafter further passed through a beam splitter and a lens, forming an image on a CCD. Also the rider can add as much steering resistance as desired for greater steering stabilization. When incorporated into a paper web, the combination of the polyvinylamine polymer and the second agent provide improved strength properties, such as wet strength properties. 50 caliber or less, and 45 ACP-sized base rims, as well as with.