It may not have looked like that when built, but we all know what a ships carpenter and blacksmith can do to fix things!
Maybe you didn't see the note in practicum because your spectacles are still on the build stand under your ship....Glued down the iron horse, but not before rigging up the block that will accept the boom rigging.
This block is stropped to the horse via a traveler ring which is why it has to be rigged prior to gluing down the horse.
In a related note: I glued down the mast.....before I read in the practicum to NOT GLUE DOWN THE MAST. I have no idea why so stay tuned for future developments.
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Maybe you didn't see the note in practicum because your spectacles are still on the build stand under your ship....