This is not a completely new concept. Spool thimbles have long been used on multi-pulley block beckets to increase the pin diameter to better suit typical sized polyester rope. But Dyneema puts a new spin on it. The rope is no longer as wide as the pin, and off center loads weaken shackles and pins, and the block or assembly may be pulled slightly crooked. If there are any sharp edges, the rope will not just contact them but be forced against them by the off-center pull.
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