Disclosed is a method for recovery of a metal using plants. Based on information input by a user and the information stored in the solvent database, an optimum condition value is determined. In one aspect, the non-elastomeric spacer is positioned adjacent a top edge of the elastomeric bushing. Up-to-date information regarding quantity is repeatedly sent and received, and content is repeatedly selected and transmitted using the information to make selections. The vertical component has a pair of bolts. The method may be used to form a resistance variable material, e.