A burnishing element is clamped to a lower surface of a bottom plate of a sanding machine and placed into tension through use of a first clamping mechanism and a second clamping mechanism that are positioned at two ends of the bottom plate, respectively. At least one of the first and second clamping mechanisms has a clamping element and a tensioning element which is used for tensioning the burnishing element. The bottom plate has a clamping area. The ends of the burnishing element are supported on the clamping area when the burnishing element is in placed into tension by the tensioning element.