Aude,
Let's say you want to add the block to a job sheet to act as a barber haul. The gurhaur blocks because of the way they are loaded requires you to bend the sheet partially around the sheave. This isn't that big a deal if the line is lightly loaded, or not at all, but when there are significant loads on the line you may or may not be able to get the line on the sheave. For me this is a critical design failure, but depending on your intended usage it might not matter to you that much.
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