Methods of releasing a well tool set in a wellbore are provided. The clearance between adjacent metal rings is set to be in a range from negative to positive from the innermost ring to a middle ring and to be only positive from the middle ring to the outermost ring. Estimates of a document’s textual authoritativeness value andor textual authority class can be used to re-rank documents previously retrieved by a search, to expand and improve document query searches, to provide a more complete and robust determination of a document’s authoritativeness, and to improve the aggregation of ran-ordered lists with numerically-ordered lists.