Abstract: A crab gauge and cleaning tool with a base and a blade having an arched upper edge and a lower edge, a coupling for removably attaching the blade to the base such that when attached the blade extends upwardly from the base in a central area of the top surface and a blade storage for securing the blade to the base, and wherein the blade has a first mounting foot and a second mounting foot with the space between the mounting feet defining a measuring distance for measuring shellfish.

Abstract: A chain saw guide bar has self-contained mechanism to force movement of the guide bar away from a drive sprocket to tension the saw chain. The mechanism includes a bearing surface that engages a mounting stud on the chain saw housing and a rotatable portion which upon rotation causes axial displacement of the bearing surface in contact with the stud.

Abstract: A sprocket assembly including a sprocket adapter driven by the motor of a chain saw. The adapter includes an adapter shaft which has a defined inner opening to fit around the drive shaft of the chain saw. A sprocket is mounted on the adapter shaft. Splines on the adapter shaft exterior fit into spline grooves of the sprocket. The thickness at the roots of the splines provide the strength to resist breakage. The exterior areas of the adapter shaft between the splines are flat landings which define relieved thickness areas between the splines and are aligned with tang-receiving pockets in the sprocket. The relieved areas permit an optimum sizing of the sprocket to the saw chain with sufficient pocket depth to fully receive the drive tangs of a saw chain. The sprocket rims are provided with mated inner edges that mate to the flat landings of the adapter shaft to facilitate transmission of the turning power from the drive shaft.