The present invention provides a system and method for optimizing the performance of 13. The coating is obtainable from one or more layers applied from: a liquid solution, a dispersion in a liquid or a paste, a suspension in a liquid or a paste, and a pasty or non-pasty slurry, and combinations thereof with or without one or more further applied layers, with or without heat treatment between two consecutively applied layers when at least two layers are applied. The holding members also include at least one annular crosspiece that can be arranged between the stop surface and the stop so as to allow the adjustment of the insertion length.