Looking at the publicity pics of Mark Hamill holding the not-from-a-Graflex Graflex I always thought the blade looked round.The Kenobi stunt does look like a square or triangular blade though.The Stunt shown looks like it did after it was modified after ANH and used in the Bespin duel.
Enjoy.
http://youtu.be/JWAniYowdeA
Enjoy.
http://youtu.be/JWAniYowdeA