i bought the stock hook plate. it won't work. the profile of the mast comp tip further down where it normally goes is too different. a custom hook would have to be made. one that is retractable and expensive. i will try something else, like seeing if the sail will actually pull from the luff track with a halyard extension to the head of the reefed sail, not a lower hook, but using the hook at the top of the pole. it works for the h16 and h21! and yes, maybe a slug in the luff track if that doesnt work.