The Windsurfer One Design is the original sailboard. Sailboarding technology has progressed since its day. Today you can probably see more Windsurfers on garage rafters than on the water. One found its way from someone's rafters into my hands. In case there's one in your garage, or someone's offered you the one in their garage, here's a little information you might find helpful.

Here is the Owner's Manual [23 pp. pdf]. It includes good brief instructions on how to sailboard. These aren't a substitute for lessons, but are a good reference and refresher.

You might find these of interest:
One Design Fix
American Windsurfer Magazine
Origins of Windsurfing: Hoyle Schweitzer
Board Sail Rigging Guide

To supplement the manual diagrams, here are a few photos of the rigging on mine.

The boom and mast from above. It's not easy to tie the boom flush to the mast. A modern clip-on boom is a nice upgrade.

The boom and mast from below.

The boom and the sail's leech grommet from above.

The boom and the sail's leech grommet from below.

The base of the mast and the sail's tack grommet from behind.

The base of the mast and the sail's tack grommet from the right.

The base of the mast and the sail's tack grommet from the left.