Funny you should mention the knotmeter.
Your reporter at large has just received an unconfirmed report that the Fluke sank due to a failed thru-hull knotmeter and they carried no wooden plugs.
Stuff a sock in it already.
Not only do I carry a set of tapered wooden plugs, but I'm one of the few people to have actually used one.
The story does not involve any crisis at sea and heroic rescue efforts. Instead, I was performing some exploratory surgery on my sink drain plumbing while the boat was in the water at the dock. Took off the bottom piece and water started coming up like a bubbling brew. D'oh