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					Originally Posted by  theducks
					 
				 
				Plugboards only affect SendToDevice 
FWIW I use Quality Check Plugin: check metadata (to find wrong way Authors) 
Anf the run the Fix: Author names to flip those found (remember to select before invoking) 
			
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 Oh.  Drat.  I just double-checked the description of the Plugboard and you're right:  "Here you can change the metadata calibre uses to update a book when saving to disk or sending to device."  So, adding doesn't count.
But, it looks like it doesn't matter.  I went to Preferences > Advanced >Tweaks > Author Sort Name Algorithm and changed "author_sort_copy_method" from its default "u'comma'" to "u'nocomma'".  Then I went to Manage Authors and hit both the Recalculate and Re-copy buttons at the bottom (thus changing all my authors back to FN LN.  When I added those 202 updated books, only 9 were considered duplicates (probably because I've edited all the titles and series names).  So, I still ended up with 193 that would have to be manually edited/merged.  I'll take a look at that plugin, though.  It looks interesting.
I've read I can just drag new files onto each existing book's Book Details panel and that will replace the original format (at least I think that's what I read).  If I open my Kindle's file structure in File Explorer, do I drag each book's folder over to Calibre or do I have to go into those folders and drag a specific file?