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APRIL JLC 1998 Products JLC's Products by Leland Stone Gyp Ripper Lots of drywallers don't bother to snap cut lines on gypboard — they just run a utility knife along a wallboard square. But the edge of the cut can taper if the knife wanders during the cut. The Rock Ripper eliminates this nuisance by capturing the knife point in one of hundreds of holes punched in the 24- inch blade. The holes are arranged in four offset columns that correspond to the blade's graduated scale; picking the appropriate hole will enable you to rip up to half a sheet of drywall to the nearest 1/16 inch. The shape of the holes automatically centers the knife blade, and