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I don't think that is it. I've seen one broken area like this after MANY years of Sunfish sailing. Most likely the screws loosened, something fell on it, or there was insufficient backing. I cannot see the picture so that does not help. Ratchet blocks and blocks with integral cleats are no problem if properly mounted.The blocks are being shock loaded, it's the sheet snapping against
a locked ratchet or knot in the end of the sheet. I use a cheap Pad-eye
and non-locking pulley.