After I got the rake I wanted on my H16 rudders, I used a trick that was on the old catsail.com site that worked great. I think it might now be on http://www.thebeachcats.com site. I wrapped the leading edge of the rudder with plastic wrap and then filled the lower part of the lower casting with silicone caulk. I then lowered the rudder into place and left it harden a day or two. This makes for a perfectly solid, but flexable socket for the rudder to rest. And being made from silicone, you can always scrape it out if you need to change things in the future.
Jack