Once the copper was removed, Ask a Shipwright presenters at Wooden Boat Festival poked and exposed the weak part of the plank. At least a dozen shipwrights used the boat for demonstrations during the festival and this was one of the first stops. The circles to the right of the worst decay are the marks from the hole saw used to free the fastners (copper rivets in steamed frames and iron or bronze screws in sawn) so the bulk of the plank could be pried off efficiently.