This adapter allows you to fit standard 120-size film into an older Kodak six-16 camera (popular in the 1930s). The Brownie six-16 was a popular model. Based on an instructional PDF by this guy over here: http://home.comcast.net/~peter.lerro/site/If you 3d print this, then stick one on each end of your 120 film spool, the film will fit in your camera! You will still need to modify the film gate and mask the viewfinder to get good results, but at least this lets you wind film through it. A good walkthrough can be found in the following PDF: http://home.comcast.net/~peter.lerro/616panoramicconversion-RevB.pdf