First time canoe restorer. Almost ready to reattach the keel and I have some questions. When I got the canoe the keel was unattached, so I'm not sure how it was attached. Where do I start, I assume after the canvas has been applied. I have noticed on the inside of the canoe at about everfy three or four ribs there is somekind of a fitting (photo) that, I believe, has something to do with the keel attachment. Not sure what or how it is. Any and all help would be appreciated.