Depending on how your lifeline is connected to your Nonsuch, you may have an issue with the main sheet getting caught as it rides up to the bail that the lifeline connects to. It’s hard to believe, but that small vertical element will catch the sheet in a jibe, causing a hard jibe and bang when it finally lets go. I’ve designed a custom part to prevent that from happening.
It can be attached with a couple of threaded bolts and easily removed or replaced if necessary. It is made from ASA which has excellent heat, UV and strength characteristics.