A method is disclosed for providing quality assurance in an industrial process. The steps include grinding used fiber reinforced plastic material such as scraps with a grinder into a predetermined length to form a grinded reinforced plastic material. The second barrier layer is then essentially removed by chemical mechanical polishing, leaving a very smooth and uniform first barrier layer. When the unique pattern is detected, the control unit is configured to receive electrogram information from the near-field instrument and store the associated near-field instrument position information with the unique pattern information and near-field instrument electrogram information. The mount comprises for example half-hoops arranged on either side of the fin.