I finally did my first water test of the M15 I'm restoring, but I noticed that it has a centerboard clunk- I can hear the centerboard rocking back and forth left and right whenever the boat isn't heeled. I just recently replaced my old swollen centerboard with a new thinner one, and it's somewhat narrower than the width of the centerboard slot. Is this typical on an M15? Has anyone with this problem installed shims or something similar? I am planning to epoxy on some fiberglass shims to the outside of the centerboard to increase it's width slightly, but first I'd like to hear if anyone else has encountered this issue before and what they did to resolve it. I also currently have a stainless steel pivot pin, but am planning to replace it with silicon bronze at the same time as I pull the centerboard to widen it. Tyler Davis, CA M15 #157 "Defiant"