New thru-hulls; easy huh? Well, first you cutout 8 4” round circles, epoxy them all together on top of a Ziploc bag which has a 4” round of wood inside. Screw the whole mess to the hull where you want to place the thru-hull. Wait one day. Drill the hole through the center, drill out the wood sandwiched between the fiberglass and fill with epoxy. Wait one day. Sand, dry fit and pre-drill all the screw holes. Apply the Groco thru-hull using 3M 5200 (one person flat on his/her stomach on the dock with the mushroom thingy that fits the outside part of the thru-hull) and screw it in. Then, you guessed it wait 5 days till the 5200 totally dries and now the thru-hull is ready to use. I did most of the work on these thru-hulls but am sure I forgot about 10 steps….
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