The Cape Dory Board

Try Dwyer Aluminum Mast Co. They are located in connecticut and I have had good service from them.

The pivot point for the boom vang should be directly below the pivot point for the boom (gooseneck). Otherwise every time the boom moves the required length changes and adjustment is required. If your eyebolt is located correctly go ahead and use it. Since you have to buy a bail to mount the vang on...

The Fisherman staysail is a rectangular (kind of) sail that is raised between the masts and above the foresail. The top of it goes from the top of the fore mast to the top of the main mast so the top of the sail is angled.

My 1976 CD 25 has an eye bolt.

the gooseneck and end fittings for your boom should be available through Dwyer. Great people to deal with. Quick service.

http://www.dwyermast.com/

I rotate the shaft and pull it out of anchor. There is a pin that goes though the shaft to prevent the shaft coming right out of the roller fitting. Sounds like the right place for a roll pin to me. Thats what I have on my CD. Sorry if I confused things.

I believe roll pins are what you are talking about. See the following: http://www.engineersedge.com/roll_pin.htm

Since the number is molded into the hull I would assume the number corresponds to the day the hull was molded and the entire number would be reset with the next hull.