The rudder on my 1983 E28+ has two blisters on it about the size of a half dollar (if anyone remembers what those look like). They are about halfway down the rudder on opposite sides near the centerline and just about directly across from each other. One is weeping a little. I'm planning to grind them away and fill them but someone recommended I also drill a hole in the very bottom of the rudder to allow any water that might be in it to drain. Has anyone here gone through something similar? If I should drill a hole or two how large should the holes be and how far up into the rudder should I drill them? Also, any advice on how to best refill them would be appreciated. Thanks in advance for any advice you can provide.
Gary
Gary