I teach this in my “Blind Blake” ebook (tab + video) https://www.daddystovepipe.com/blind-blake-ebook.php
Key of D, drop D tuning
I’m playing a Supertone from around 1927 called “the Lindbergh” design since of its airplane shaped bridge.
Listen to Blake’s original https://www.youtube.com/watch?v=dabkCt8FRL8