I highly recomend part number 6410001- the anchor plate kit on all h 18's sailed hard. I broke my last one in SF bay at the port outer cross arm connection point. I put a little glass in the outboard hull- someone else probably has a better layup, but I used 3 layers of 6 oz cloth in the semicircle where the anchor plate goes, and 3 layers of 6 oz 6 inch tape feathered fore and aft and about 14 inches down the hull. The boat seems very stiff now. I also upgraded to screw in inspection ports and used 3m 5200. 5200 actually has some structural properties, unlike Silicone. We will see if I ever pass anyone in this thing...
It's only a little harder to pull up hills with my Caravan now.
Gotta be willing to glass by brail.
If not, forget the glass, the plate is the key component.
Yeah, I'm a novice, but I've seen one of these break.