Boardlady. Probably the best site I've come across.
Team AirBorn. It looks like Bob Shilito (WSM windsurfer) has put this site together.
Keweenaw Windsurfing. Scroll to the bottom of the page - there are a few links there that may be useful, including how to make your own fins, with dimensions for all popular finbox heads.
DIY Repairs? - here are some good websites.
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DIY Repairs? - here are some good websites.
It's an ill wind that never blows at all.