I can chock out the top and bottom pintles, but this has very little affect on rudder balance or boat balance. Its only influence is on ventilation (not cavitation which isn't a concern on most sailing yachts). The blade rotates with the stock and pintle so its leading edge is always about 5mm in front of the rotation axis (centre of pintle).

Some of the flip-up rudders have screw adjustments at the bottom of the stock which bears against the leading edge of the blade. Screwing one way rotates the blade aft of vertical, screwing the other way rotates the blade fwd of vertical. ie. the blade rotates either aft or fwd relative to the pintle from a few millimetres fwd to a few millimetres aft of the pintle axis. This again doesn't have too much influence on theoretical performance, however it has a huge affect on the tiller force to steer the boat. Rotating the blade forward makes it more balanced hence less force on the tiller, and moving after makes it less balanced which leads to more force on the tiller. Please note that the force on the rudder only changes minutely (negligible actually), but it is the lever lengths that are changing the force the skipper feels on the tiller.

Which of these "rakes" are you interested in?