A method for automatic frequency tuning in a phase lock loop suitable for use in multi-band VCO wireless systems having very limited initial frequency lock times is disclosed. The structure module is to identify a structure metric based on an input digital image, and remove a structured nonuniformity from the input digital image to produce a second input digital image. Rotating disks compress the metal into an elastomeric roller to create the hew line-simulating bends. A supply station puts each article into one holding apparatus, with the result that the article is situated between the lateral faces and is held by the holding apparatuses. The end caps not only confine the flap packs in the hub slots, but also engage the projecting ends of the flap packs to dampen vibrations between the flap packs and the hub, and center the hub and tool on its axis of rotation.