The invention features a self-contained, portable apparatus for performing precision grinding operations on metal disks of up to, e. The apparatus including a roller assembly for engaging at least a portion of a belt, a pair of laterally spaced support arms and an actuating assembly for pivotally moving at least one support arm. When a home agent receives a registration request from the mobile node, the self-selection method enables each home agent to independently and randomly generate a value that falls within a range of numbers. The spring lock is adapted to engage the security pin when in an engaged position and release the security pin when in a released position. The system in turn comprises a series of feeding and recirculation conduits and reservoirs the temperature of which is regulated to perform the polymerization in a controlled manner.