[quote=wlrottge]I've spent a TON of time on the I-20, but don't remember how the main halyard was setup.... I swear that we used a welded ring/shackle.
Two things, first, how is your line tied to the ring? If you have the line run through with a stopper knot on one side, it matters if the knot is towards or away from the mast.
Second, you have to make sure the mast rotates to 90 degrees to get it to unlock; if it doesn't go on one side, try it going the other way. It will depend on your angle to the wind.
Also, the owners manual shows a ring and twist shackle for what it's worth.
[url]https://nacrasailing.com/wp-content/uploads/2019/08/nacra-500-570-blast-i-17-i-18-f-18-i-20-manuals.pdf?x42148[/url][/quote]
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