One of the beautiful things about the high load thimble is it's simplicity. There are no moving parts and it is turned from one piece of aluminium. This makes the finished product extremely strong and lightweight for its size. To compare; a 20mm block weighs 10grams and has a maximum working load of 115kg. A 20mm high load thimble weighs 2grams and has a maximum working load of 400kg. That is an 80% weight saving to a 247% working load increase.
So why isnt everyone replacing blocks for high load thimbles?
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