Loading and unloading the P6x7/P67 is something that is often overlooked as trivial by new users of the camera. Unfortunately loading correctly and safety is paramount to avoiding the debacle that is the subject of this thread!
Loading and unloading made easy:
- First install an empty spool on the the right, ensuring it is seated and lock the clasp. Rotate the feed slot into view.
- Next, open the bottom clasp of the roll side and wrangle the roll into place. Lock the clasp when it is seated.
- Put your pointer and index finger at the top and bottom of the fresh roll, maintaining light pressure while pulling the leader out across to the take-up spool and into the feed slot.
- Wind on until the START line comes into view and lines up with the marks on the film guide rail.
- Release fingers from roll of film and close the back. Finished.
Never allow either a fresh roll or exposed roll to become 'floppy' or lightly unwound during the process. With high speed films (400ISO-plus) the process is best done stuffing the camera in a jumper or some other place to provide added protection against light penetration.
When the entire roll is exposed, that is also a trouble point where light piping occurs, and again, two fingers are required to apply pressure to the roll while winding on until you are able to grab the tail of the film and tape it into place. Unlock and pull down the clasp and remove the roll, wrapping it in tin foil to further protect against light piping. That's the last you should see of the roll until either a) you process it or b) a lab processes it.