Sonic
They are best altered by removing your rudders by unbolting them and then drilling a second hole off centre in the rudder.
To find the spot. hold your rudder at the desired angle next to the rudder housing. IE parallel with the rudder box, in the "down" position as if your boat was in the water. Mark the spot with a marker through the bolt hole that the rudder pivots. [That's probably off centre by 3 - 5 cm]
Drill the rudder[s] at this position and put it all back together again, using the newly drilled holes. Then any minor adjustment can be made using your rasp etc
OK, that seems like a more reasonable alternative to filing my rudders, I have attached a diagram just to ensure I understand correctly.
The angle is probaly a little exagerated, but I'll adjust the rudders to rake 50mm forward of horizontal/level as per the maricat association website, on the understanding that this will releive the helm "feel", if per chance I should have Lee Helm after this adjustment, I can further rake my mast back a notch to correct this back to a slight Weather Helm "feel".
My mast can be further raked aft as there is adjustment to do so on the side stays. As the mast setup is at the moment there is no forward adjustment left on the side stays so as to have a vertical mast, or less rake than what I have at the moment ie: 600mm aft.
I hope thats not to confusing.
