Abstract: A brush holding device includes first and second holders to respectively hold two ends of a brush mandrel of a wafer cleaning brush. The second holder includes a second housing, a second inner case mounted inside the second housing, a second bearing unit mounted inside the second inner case, and a hollow second shaft journaled in the second bearing unit and having a cleaning liquid passage. The second inner case is made of plastic, such as, polyformaldehyde, and has a retaining part extending around and projecting outwardly from an outer peripheral surface of the second inner case to contact an inner peripheral surface of the second housing. The retaining part is formed as one piece with the second inner case.

Abstract: A safety sinker includes a sinker connected to a fish line through a sinker coupler, wherein the sinker coupler may be pulled, by means of a fish line, to disconnect the sinker from the fish line when the sinker is squeezed in between rocks or somethings during fishing. The sinker coupler includes a fork end having two semi-sphere members made thereon for connecting the sinker when they are squeezed to form into a spherical configuration and inserted into the inner chamber of the sinker. The two semi-sphere members may be squeezed to form into a spherical configuration again, by means of a pull force through the fish line, so as to slip away from the sinker and to disconnect the fish line from the sinker.