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Left Foot Gas Pedal. The (LFA) was designed for the driver that has lost control of only his right foot, with an (LFA) accelerator installed to the left of the brake pedal the problem of applying the gas is no longer a problem.
Basically it's an axle that's threaded at one end and has a platform of sorts at the other. The threaded end goes into the crankarm and the platform goes under your foot, then you push. The left side pedal has a reverse thread to keep it from unscrewing from something called precession as you ride.