Go to the home center or hardware store and pick out a long 5/16 bolt. Find the grommet that fits tight on the bolt. Get several in case you don’t get it right the first time. You don’t have to but it makes it somewhat easier if you cut of the head of the bolt to spin the grommet in your drill. (special tool) I used contact cement to glue some 220 and 320 sand paper on either side of a piece of wood. Heat gun will soften cement when you need to change the paper. Usually, with heat, you can change the paper several times without adding more cement.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.