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Majority of fasteners produced by Hi-Shear Corp, Los Angeles are destined for aviation markets; most units have blind hole for Allen head wrench; these holes represent production problem in that quench oil and cleaning agents have tendency to resist removal from hole's base; residue causes scaling problems when parts undergo final tempering, and also introduces contaminants into atmosphere and vacuum furnaces; advantages of Vibra-Degreaser installed to eliminate residue buildups, and simultaneously increase plant output; unit uses perchlorate cleaning solution, and operates at 250 F; it has lowered cleaning cycle times from 2 1/2 hr to about 3 min.