Did some further exploratory work on the pivot for the brake pedal. Since there aren't any drawings of the pedals and their internals, I wasn't sure what was inside originally holding the toe straps in place. As I worked up to a progressively larger hole on either side, I learnt that the straps were held in place by an aluminum shaft that ran through the centre of the rudder pedal tubing. Once this was confirmed the obvious solution would be to enlarge the hole to fit a oilite bushing that a long AN4 bolt can pass through and the brake pedal can pivot on.