spark control and front brake operated by the left hand. The Harley-Davidson rocker clutch was operated with the left foot with the heel down position to disengage the clutch (with an over-center spring to hold the clutch disengaged) and the toe down position to engage it ("Toe-to-go"). The right foot operated the rear brake, as is the practice in modern times. Indian, meanwhile arranged things differently. On an Indian, the tank shifter was located on the right side of the motorcycle, with the throttle operated by the left hand and the shifter, spark control and front brake operated by the right hand. (Indian promoted their system to police departments saying that the officer could fire his service weapon with his right hand while riding) The Indian rocker clutch was also operated by the left foot, but the toe down position disengaged the clutch and the heel down position engaged it. Harley-Davidson introduced the hand clutch on the 1952 Panhead, and simultaneously on the K model, their all-new sport model. The transmissions of the foot shift and the hand shift models were different. The hand shift gear selector mechanism was referred to as the "jockey top" or "jockey lid." On this transmission, the gears were selected in a linear fashion with the selector arm moving further and further forward with each successive gear and the gear lever moved in a slotted gate on the side of the tank. When modified to operate as a "jockey shifter," The lever would be pushed back for 1st gear and then step by step more forward for each subsequent gear. The foot shift gear selector mechanism was referred to as the "ratchet top". On this transmission, the gears were selected in a ratcheting motion, returning to its default, central position after each shift. When modified to operate with short, transmission mounted hand lever and a foot suicide clutch, this type of set-up was referred to as a "slap shifter" or "slapper". In contrast to the jockey shifter, the slap shifter would always stay in one central position between shifts. Throughout the 50s and 60s on the Panheads and subsequent Shovelheads, foot clutches and hand clutches coexisted, with the hand clutch being progressively more popular over time. After foot clutches had all but disappeared from Harley-Davidson civilian models, the last holdout of foot clutches were the police models up to the early 70's, presumably because the