This is in the category of one-thing-leads-to-another. I put a 3-cell liop in my Rolleiflex 6008i and it worked so well, I put one in my Rollei e36 flash. Now that the flash works, I can use my Polaroid 250 camera. But, in the mean time the film is discontinued. So, what to do. Thus this project: Make an Instax 6x9 Graflok film back for the Horseman VH-R. I have done much of the on-line research for the project already, and am ready to start buying stuff.