Dan, thanks for the reply. I am attempting to mount a focal plane shutter from a Speed Graphic onto the front standard of a 5x7 Ansco View. Essentially, I want to make a shutter box that attaches to the back of my front standard. The bellows "quick release" is so that I can swap between attaching the bellows to the front standard and the shutter box. Unlike a Packard, I will need to attach the bellows to the back of the shutter box.