Paper coated with a coating slip containing at least one optical brightener is produced by a process in which base paper or precoated paper is treated, before application of the coating slip containing optical brightener, with at least one substance which enhances the efficiency of optical brighteners. The assembly is generally universal in that it can be incorporated with substantially any make andor model of a motorcycle to replace the front end suspension of the motorcycle with a springer front end suspension. The devices give buildings adequate wall and roof system ventilation and moisture vapor release portals so as to better prevent mold and other water related damage. The fixed potential electrodes of the respective storage capacitors Ctd and Cts are electrically connected to each other and connected to the ground etc. The rotational speed of the vacuum generator is controlled on the basis of the set vacuum requirement. The method includes fractionally distilling heavy hydrocarbon compounds synthesized in the Fisher-Tropsch synthesis reaction as a liquid into a first middle distillate and a wax fraction, and fractionally distilling light hydrocarbon compounds synthesized in the Fisher-Tropsch synthesis reaction as a gas into a second middle distillate and a light gas fraction.