A method for forming a high aspect ratio magnetic structure in a magnetic write head using a combination of chemical mechanical polishing and reactive ion etching. A method for advancing articles to be shredded is also described. The bearing elements are fitted with slide elements, having a sliding surface directed towards the shaft. The processor then receives responses, provided by a customer, to an attribute questionnaire. At least one flexible track comprises at least one slot produced over at least a part of its length, the slot delimiting a plurality of flexible beam sections of determined profiles. Then, in each of the image sub-segments, the distortion caused by the positional change of the image-taking device in the taken image is corrected on the basis of the rate of the positional change of the image-taking device detected for each of the image sub-segments.