On later 18th and 19th century vessels you would find metal bands on yards to secure block strops to. Generally, on older ships, rope was commonly used in place of iron for many rigging attachments. Block strops were rope, as were mast wooldings, and anchor rope, not chain. See the sheet and clue line blocks attached to the yard below on the 18th century ship. Every time you research into a ship from a different time, you see changes in materials and rigging methods. Generalizations are hard to make because information on actual ships is full of holes and variations not just across time and country of origin, but between individual vessels abound. The amount of guesswork building a 17th century and a well documented 19th century English ship model is VAST. Imagine trying to build an accurate replica of an ancient Greek or Egyptian vessel...
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