Hello photo forums! About a year ago I decided I wanted to try my hand on a Zenza Bronica S2a, I have always wanted to shoot on medium format film. Everything appeared to be working until I went to snap a photo. The problem I am having is, when I twist the film it never locks into place, it rolls all the way to the end of the canister. I had some recommending I try a different back, I can confirm this problem does not go away with three different S2 backs. I decided to get some opinions at a few local camera shops, two owners told me Zenza Bronica specialists are rare to come by these days. Someone in the Washington DC area had come to their minds, but informed me it would probably be more expensive than buying another one. I also had the camera shops load the film just in case I was not loading it correctly, but no dice. Has anyone experienced this problem before on their S2's, help is much appreciated.