I have a 1992 Prindle 19 that has the original rudder assembly. I upgraded the sail plan to 19mx a few years ago and am now considering upgrading to the longer rudders. My question is whether I should replace my rudder castings as well due to 16 years of wear. You can sort of see in the photo that the slot in the casting widens considerably where the spring bolt catches the lock bolt. Is that by design? or from wear? There is considerable fore and aft play in the rudders when they are locked down.