Pasteca with opening Ubi Maior YC60 with swivel shackle for 12mm

This mechanism, called Ubi Maior YC60 opening with a rotating shackle for 12mm what you will find in SAILBOAT BARTON BLOCKS, is a useful equipment used in boats, they have grooved wheels that rotate around an axis, where a rope or rope slides to generate a displacement that allows to lift weights, in a very simple way, since pulling the string downwards, the manipulated body is easily raised.

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