Abstract: An apparatus for cleaning firearms comprises a rod, a handle, a first cylindrical body portion, a second cylindrical body portion, a stick, and a fiber wad. The handle is attached to an end of the rod. The first cylindrical body portion defines a channel and a longitudinal break in a sidewall of the first cylindrical body portion. The channel and the longitudinal break extend into the first cylindrical body portion from a first end of the first cylindrical body portion, and the longitudinal break at least partially merges with the channel. At the same time, the second cylindrical body portion is attached to a second end of the cylindrical body portion and has a smaller diameter than the first cylindrical body portion. The stick is at least partially inserted into the channel. Lastly, the fiber wad is wrapped around at least a portion of the stick.

Abstract: An apparatus for cleaning male electrical pins comprises a base portion, a first cleaning extension, and a second cleaning extension. The first cleaning extension extends from the base portion and defines a first substantially half-cylindrical shell. Likewise, the second cleaning extension extends from the base portion in a direction substantially parallel to the first cleaning extension, and defines a second substantially half-cylindrical shell. The first cleaning extension and the second cleaning extension define a gap therebetween. In addition, each of the first and second substantially half-cylindrical shells comprises a respective knurled surface region facing the gap.

Abstract: An internal combustion engine is analyzed by an apparatus having a data processing capability. The engine has a plurality of cylinders and a battery operative to power a starter motor. The apparatus measures a time dependence of voltage level or current draw at the battery while the engine is being cranked by the starter motor. The apparatus also measures a respective time dependence of pressure at each of one or more locations in the engine. From the measured time dependence of voltage level or current draw, the apparatus determines a respective value indicative of a compression for each of the plurality of cylinders. Furthermore, the apparatus determines the presence or absence of one or more defects in the engine from the one or more measured time dependences of pressure.

Abstract: An apparatus for cleaning male electrical pins comprises a base portion, a first cleaning extension, and a second cleaning extension. The first cleaning extension extends from the base portion and defines a first substantially half-cylindrical shell. Likewise, the second cleaning extension extends from the base portion in a direction substantially parallel to the first cleaning extension, and defines a second substantially half-cylindrical shell. The first cleaning extension and the second cleaning extension define a gap therebetween. In addition, each of the first and second substantially half-cylindrical shells comprises a respective knurled surface region facing the gap.

Abstract: An apparatus for cleaning cylindrical female electrical terminals comprises a cylindrical shaft portion, a first cleaning extension, and a second cleaning extension. The first cleaning extension extends outward from the cylindrical shaft portion and comprises a first curved and knurled surface region. Likewise, the second cleaning extension extends outward from the cylindrical shaft portion in a direction substantially parallel to the first cleaning extension and comprises a second curved and knurled surface region. The first cleaning extension and the second cleaning extension define a gap therebetween.

Abstract: An internal combustion engine is analyzed by an apparatus having a data processing capability. The engine has a plurality of cylinders and a battery operative to power a starter motor. The apparatus measures a time dependence of voltage level or current draw at the battery while the engine is being cranked by the starter motor. The apparatus also measures a respective time dependence of pressure at each of one or more locations in the engine. From the measured time dependence of voltage level or current draw, the apparatus determines a respective value indicative of a compression for each of the plurality of cylinders. Furthermore, the apparatus determines the presence or absence of one or more defects in the engine from the one or more measured time dependences of pressure.