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Donk107 said..
I found this explanation on a web site
Halyard Locks & Ball Swage Hooks
Racing Boats, especially, use a variety of Ball Swage Hooks or special Main Halyard Locks. Mounted at the Masthead, they have the advantage of reducing the halyard compression load on the Mast by half. On smaller boats they are used closer to the deck for convenience and repeatability of sail hoist height. Once the Lock is engaged the Mainsail is tensioned using a downhaul or Cunningham.
Regards Don
If the tension on the main is taken to the same level with both systems . Then i would have thought that the compression on mast was the same ?
I agree with MB its too risky .
Lets hope those affected in these incidents are found OK . Its a terrible situation.