Have your thyroid checked.
I was thinking that he meant that the keel was attached to the mast, not to the bottom of the hull; a hammer made of mast and bulb, stuck through...
Probably Phil Bolger, in "Boats with an Open Mind". You should write to him and purchase a set of the complete plans, they'll make it much easier.
Local sporting goods store; they're used for storing & shipping fishing rods. Or a kite store. A friend uses the plastic tubes used for the...
Noel, noel, come this night ... Merry Christmas!
[sigh] He is always making "better idiots", which in BBS terms means "nastier trolls". I don't think that moving here is really going to help...