Blimey, your knife cuts both ways…
I completely looked through that; in fact it took me three reads of the post to see what the issue was.
I imagine it's because as well as the Worden grinder there was a 'Woden' tool making company so it just didn't ring a bell.
I have both spellings in my 'personal dictionary' so it wouldn't have come up with a wiggly red line.
Even if we had a proof reader (that would be a luxury in this modern age!) I doubt they would have spotted it.