There seem to be at least two kinds of rudder shoe on Bristol 24s. One is bronze, but I don't know whether that is original equipment. The other is molded into the hull and has a captive pin that fits up into a recess on the bottom of the rudder. So it seems that in order to drop the rudder it will be necessary to uncover the bottom of the pin and both ends of the bolt that holds the pin in place.
Did your guy have any trouble getting the stuffing box apart? Mine was a bear.