police officers could use their 2-way radio with the left hand while clutching with their foot. The jockey shifter is a gear shifting device used on motorcycles before the use of a foot-operated shift lever. A jockey shifter gets its name from the location of the motorcycle rider's hand when shifting gears. It is under his seat like the position of a jockey's hand while using his riding crop on his horse. This hand shifter lever is directly mounted to the transmission and is just long enough to clear the primary drive cover or belt drive. A motorcycle equipped with this type of shifter requires the use of a foot clutch. The foot clutch comes in one of two configurations; either a rocker foot clutch, which was stock on many early motorcycles, or a suicide foot clutch, which was never available on production motorcycles but was manufactured by daring motorcycle enthusiasts. The suicide foot clutch was usually a very simple lever, more or less a mirror image of the rear brake lever on the other side of the motorcycle; like a standard shift car's clutch lever. The rocker foot clutch is easier to use than the suicide foot clutch because it can be rocked into a position where the clutch is either engaged or disengaged - leaving the rider's foot free to be put down, at a stop, to steady the motorcycle. Sometimes a tank shifter is referred to as a jockey shifter, but this is incorrect due to the rider's hand position being in front of him, not behind him like for a horse jockey. A tank shifter is also connected to the transmission with linkage, which jockey shifters do not use. The earliest known use of a foot clutch and hand shifter, on motorcycles, was with the first multi-geared transmission on the 1915 Harley Davidson. It is a mechanical linkage that is typically mounted to the left side of the motorbike's fuel tank and is held in place by a slotted piece of metal welded to the frame or the tank. Through a series of linkages, it is connected to the transmission shift selection lever. In terms comparable to a motorcycle of current construction, it is simply a way to relocate the shift lever from the front foot controls to the side of the gas tank. Early motorcycle customizers who were trying to reduce their motorcycle's weight so