Other people have shown their synthetic standing rigging setups, but this video is made by the guy who invented the system that they all use! Watch and learn directly from The Rigging Doctor.

Herby reinstalls two synthetic stays on the mast and shows you the whole process! First, the stay is attached to the mast with a clevis pin and toggle. Second, the lashing is fed through the end of the stay and deadeye, then a purchase system is setup which can be tensioned using the cockpit winches.
At the end, Herby ties everything off using a knot he developed called "The Shroud Frapping Knot".

Lastly, Herby also discusses how to check for the correct amount of tension in your rigging and how to tune the mast so that everything is perfect.

Shroud Frapping Knot:    • Synthetic Standing Rigging: How to Te...  

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