That's it: The sum of my knowledge of sail making.

To recap:

• Leech goes the long way on the tarp
• 3" of hem material for a 1.5" doubled over hem
• #16 needles
• Upholstery or Heavy 100% polyester thread - No cotton or blends.
• Lots of thread tension
• Widest possible zig-zag stitches.

Now go forth and make beautiful sails.