Quote Originally Posted by andreios View Post
Yes, that was my idea - to find a graflock back...
I presume 4x5 will be no problem for a half plate camera - but would a half plate camera be enough to take a 5x7 back?
Yes a 5x7 back would fit, the pre WWII British Half plate cameras used book-form plate holders which were larger than modern half-plate or 5x7 holders (the modern ones have the same outside dimensions).

5x7 backs do get advertised on this Forum, if you Subscribe you could place a wanted advert