Thanks for the reference to F18s, Mary. That system is great for attachment to the rear beam. We always used bungeed Hawaiian style righting lines on H16 and H18s: this is a W arrangement (with knots) on each side of the boat, with the center of the V restrained to the back of the boat with a blocked-bungee return to the front crossbar.
There has to be a reference to this somewhere in the archives.
This Hawaiian Style chicken line saved a lot of unhappy crews, by limiting pitchpoles back in the day of big, superb racing fleets in Florida, and nasty bruises too, trust me. When your crew trusts you (note for Doug Snell in TX), they continue to crew.