One thing I noticed with steel reels and 120 film.... Once I am done winding it up and let go of the end, it quickly releases tension and spins a bit. You can even hear it. I noticed, at this very moment, portion of the film can slip out of the groove. What I do is let the end go carefully so that it won't "spin" at a rapid rate. Also, I had a slightly bent reel which had very bad tendency to lose the film. It was obvious when I put it on a level surface and looked at it side ways.