>>13539434well if they could make their hulls water tight out of joined pieces of wood then surely they could use a similar process to join and seal the inner surface of the tube and bind it to a chiseled helix.
I dunno, 3 pieces two cross sections for the tube and a monolithic helix. Just need some form of water tight adhesive to bind it all together.
perhaps chisel in a helical guide/rail in the tube to make it easier to fit and lock in place akin to a bolt and nut with loctite.
Feel free to call me a stupid poopoo, at least I tried.