Put inspect port in middle of back deck.? When you pry off the fiberglass circle,? leave as much Styrofoam as you can,? but it's OK to remove brown/ yellow 2-part expanded foam around it.? That is the glue to hold blocks in place.? With the port centered,? you can reach the back for rudder mounting work and the back of the cockpit tub to install hiking strap eyestraps. Since the boat has leaked,? you want to dry it out and replace the rotted backer block.? ?I have not bothered to fiberglass new backers in place,? just used sealant.??

While working,? tape around the cut opening so you don't get fiberglass fibers in your skin,? mount the ring when you're done.? ?Bigger opening to work through ...