We used the same halyard wrap for the same reason but ultimately had the “sock” recut to tailor fit the rolled sail. As others have noted the sock also had lacings to snug the whole thing up. Sunbrella worked great for UV protection of 3di sail but PIA. I’m not a fan of sunbrella sewn to the leach but debating it for our next cruising boat for ease of use - apparently getting old and lazy.I've found that the sock suffers from vortex shedding in any breeze and the whole forestay and the boat would start shuddering. The solution was to spiral wrap a spare halyard, so the air flow was broken up.
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