I started by drilling a 7/16 hole through my brake petal. I cheated a bit and simply drilled out a whole that was already in the pedal. I was curious to know what that whole is used for on a stock cart.
Finished product below. I still need to drill the whole bigger on the rubber side as the instructions on the kit state that the screw on rubber bulb should be close to flush to the pedal. To do that I need at least an 1" hole on the top side.