Abstract: This invention relates to a sled-guide-assembly, in particular for an optical attenuating device, comprising a straight guidance and a sled, which is movable within the guidance, wherein the guidance has an inner contour, comprising two guide rails, extending parallel to each other, the inner contour comprises a receiving space between the guide rails, the sled comprises an outer contour arranged in the receiving space, and supports an object, in particular an optical attenuating element, outside of the receiving space, the outer contour comprises first edges and second edges, the first edges rest against the guide rails at a first side, which is turned to the object, and overlap this first side transversally to the longitudinal direction of the guide rails, the second edges rest against the guide rails at a second side, which is turn away from the object, and overlap this second side transversally to the longitudinal direction of the guide rails, the second edges are flexible and abut with tension aga