I had a 1919 3-1/4" x 4-1/4" Revolving Back Graflex back hinged top-front curve, see p. 33 bottom photograph,
THE AMERICAN CAMERAS a review of GRAFLEX®, by Richard P. Paine, 1981, Alpha Publishing Company, Houston, Texas
I had to stop using it because body frame wobbled and made the shutter unreliable. A retired Graflex and Graphic repairman at
www.graflex.org looked at it and said it was not worth repairing. But it was still too bulky to use with an adapted RH-12 as a MF camera.