May I suggest, that instead of trying to follow the difficult and ambiguous instructions, you purchase a book on square ship rigging. Learning the basic lines from a book such as Peter Lennarth’s
Rigging Period Ship Models is really where you want to go if you want to understand rigging easily. Once you’ve rigged, one ship, the next is easy. You’ll know what all the lines are for, and how they work. That book will teach you using pictures and diagrams of all the types of lines. Then return to the instructions and see how they rig each line. Be prepared to find differences and errors in the instructions.
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