Abstract: Provided are two drop tubes and two case tubes with each case tube slidably receiving an associated drop tube. A sub-structure below the two drop tubes is formed of two wheels and two side plates. Each side plate is adapted to couple an associated wheel with an associated case tube. A super-structure above the two drop tubes is formed of two wings. Each wing has a C-shaped configuration. The two wings are positionable in a first orientation parallel with the drop tubes. In the first orientation, the two wings are laterally spaced from a vessel when the drop tubes are horizontal for transporting the vessel. The two wings are positionable in a second orientation perpendicular to the drop tubes. In this second orientation, the two wings form a cradle for supporting the vessel thereupon when the drop tubes are vertical for launching and retrieving the vessel.

Abstract: A mechanical device for abrading the surfaces of workpieces is disclosed in which a power driven perforated abrasive coated endless belt comes into intimate parallel contact with a rotatably driven slotted disc platen. The perforated abrasive coated endless belt is oriented so that its noncoated side contacts the slotted disc platen. The periodic alignment of the slots of the revolving disc platen with the perforations of the abrasive coated endless belt allows an operator to continually observe a workpiece while its surface is being abraded.