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Just yesterday I found out that the power metal band 'rebellion' have a song about the ulfberth sword

Rebellion - Ulfberth - YouTube

Thanks for the video. Still watching it.
One minor nitpicking: the guy John Clements doesn't really have good skills with a katana. He wields it like a broadsword. that's a pretty bad way to use it.

Ah :)

As I said, convenience has never counted for much (if anything) in Japan.

The guy I mentioned earlier practices kyudo (Japanese archery). Every year, they have some kind of archery event...

The viedo is unavailable at the moment.
What was the subtle secret you are talking about?
Knowledge itself is only one ingredient. Without the availability of the required materials, nothing would...