So heres the deal, I recently bought a near mint Koni Rapid Omega 200 with one 120 back. Thankfully the frame spacing is good, the issue is an entirely different conundrum. As I shoot and advance the film the backing paper slowly walks up the take up spool and out and around the flange. Strangely enough the images remain centered on the film, even though you can tell this starts happening early on in the roll by looking at the exposed roll of film. Now this wouldn't be a problem except that sometimes when I unload the camera one edge of the last one or two frames gets a little bit of fogging. It doesn't always happen but more often than not it does. Has anyone ever seen this problem with an Omega film back and if so is there a fix besides hunting down and buying another back, or unloading in complete darkness?