A long time ago, I bought a used FM2N and needed it right away. I literally took it out of the bubble wrap and loaded it with film for a job. It left scratches on the base side of the film too. I noticed that the silver screws on the take up side of the film transport were sticking into the camera body. I assume that the screws were of the wrong length and used when the camera was repaired at some time before I bought it. I ended up sending the camera back and bought a new camera instead, and it is the FM2N I own today- and no scratches.

steve