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Mistral 16’ sailing dinghy has a centre board. On the underside of the hull on either side of of the centre board there are two 5’ long 3/4” wide plastic strips attached with rivets into the hull and holding two fabric strips through a which the centreboard passes as it is raised or lowered. These plastic strips have dried and cracked into shorter pieces that can rotate and block the center board. What method should be used to attach replacement plastic strips. Could screws be used instead of rivets?
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They probably used pop rivets at the factory because it's a lot faster than screws. Do you see the heads on the inside? Things must have been well bedded to keep it from leaking. The rubbing strip has obviously been quite useful.
 

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Screws won't be as strong as rivets. I would drill out the old rivets and replace them with new ones. Through bolting is a reasonable alternative to rivets, but if you don't have access to get a tool on a nut, rivets are often the best. Rivet tools start at about $15. They aren't expensive items.
 

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I'd be tempted to strip that off, epoxy the holes and lay down a couple of strips of glass fibre and refinish. Careful not to weld the board in place ..could rip some wear strips off a pvc pipe and add to the wet epoxy .
 
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