I just picked up an older sunfish, and the old wooden centerboard is missing a chunk about the size of a thumb (about an inch deep, 3" long - probably less) from one of the edges near the bottom. I need to sand and re-varnish the thing anyway, but would I be crazy to try and fill it with a wood filler of some sort, or even to square off the hole and put a new chunk of wood in it, then varnish over the whole thing? Unless I can find a plastic replacement board at a good price, Im trying to keep my costs down - I dont mind doing a little more work though. What do you all think?