Deep ripper The Earthquake disk ripper, available next year from Brent, has shanks that are adjustable in 1-in. increments and tills soil 12 to 18 in. deep. Spring-cushioned shanks located on either 24- or 30-in. centers provide 4,380 lbs. of trip pressure. The ripper's mainframe with self-leveling hitch is constructed of high-strength steel. It lists for $43,300. Contact Unverferth Mfg. Co., Dept. FIN, Box 357, Kalida, OH 45853, 800/322-6301, www.unverferth. com or circle 208.