Abstract: A screwdriver accessory is disclosed, the preferred embodiment incorporating a central rubber grommet having an axial passage therethrough, the axial passage frictionally gripping the shaft of a screwdriver. It is surrounded by a disk of polished metal. In an alternate form, the axial passage through the rubber grommet is made rectangular to fit around the spade of a screwdriver. It is also constructed with a multilayered disk, an alternate additional layer protecting the lip and periphery against damage.

Abstract: A bidirectional odometer having preset features is disclosed. It further includes means for scaling the rate of counting. It incorporates a set of three, four, five or six decade gears of counting gears having numeric indicators thereon and a variable input. The gears are locked together in a sequential chain. The chain can be broken by moving retractable idlers which are moved away to permit repositioning. The device further includes an adjustment controllably locating a multiplier on positive or negative sides of a lead screw to obtain ascending or descending counting. It further incorporates a power take-off drive for rotation of the gear chain from a speedometer cable or the like.