I've got two 16 masts that have just one rivet on each side, about even with the thickest section. They've worked just fine for years, however I believe the catalog lists three rivets. I would guess the third would go in the front. It's quite common however to see masts with several extras added for extra strength?



I hope you're replacing this mast base, it doesn't look very solid. The plug is usually made of closed cell foam with a polyurethane sealant around the plug. I've been able to pry one lose to clean out sand that somehow got into a mast, and later resealed. I don't know if Hobie offers a plug for the mast, but a replacement could be made if needed.