Minox cassettes are about the easiest submini cassette to reload. Minox film is technically specified as 9.4mm wide. But for self loading, it is better to slit it slightly narrower to 9.2mm to prevent jamming the cassette.

1. Memorize these instructions since you can't refer to them in the dark; better yet, run through the steps with the lights on with scrap film.
   
   

2. Gather all your items together -- Minox-size film, Minox cassettes, scissors, 1/4" black tape, and film template.
   
   

3. Wash your hands thoroughly, or use film gloves (obtainable at most camera shops) in order to avoid getting oil or dirt on the film.
   
   

4. With the lights on, remove the caps from the film-feeder end and the film-takeup end of the cassette. The film-takeup end is the end of the cassette that has a deeper depression and holds the film-takeup spool. The cap on the film-takeup end has a hole in it to allow the camera to advance the film. The cap on the film-feeder end is solid.
   
   

5. Remove both caps, and remove any tape and film from the film-takeup spool.
   
   

6. Completely check the cassette for any loose dirt or film scraps.
   
   

7. Turn off the lights.
   
   

8. Cut a length of film for the desired numbers of exposure, using a template, ruler or whatever you can device. A yardstick with a notch or piece of tape at the desired length will work fine.
   
   Exposures  Film Length
   
   15  --  32 cm  12.9"
   30  --  52 cm  20.3"
   36  --  59 cm  23.2"
   50  --  77 cm  30.1"
   
   

9. Wind the film tightly into a roll, and pull out a 1-2" leader. Make sure that the emulsion in wound in toward the center of the roll.
   
   

10. Slip the leader through the film outlet while dropping the roll of film into the film-feeder end of the cassette. The film slot can be difficult to find in the dark, so you may need to practice with the lights on with a scrap piece of film.
    
    

11. Place the cap back on the film-feeder end of the cassette.
    
    

12. Repeat #9-#12 for any additional cassettes.
    
    

13. Turn on a dim light.
    
    

14. Check to make sure that the film is loaded correctly -- emulsion toward the lens. Some early metal cassettes may require a small strip of tape to keep the cover in place – press the film-feeder cap and cassette together and attach the film-feeder cap with 1/4" black tape.
    
    

15. Line up the leader of the film with the film takeup spool. Make sure that the open end of the film-takeup spool is facing in the right direction. The film and the spool are exactly the same height and the film must line up exactly with the edges of the spool. This will help prevent the film from detaching in the camera.
    
    

16. Tape the film to the spool so that the tape loops around the spool and attaches to the film on both sides of the film.
    
    

17. Slide the film into the takeup film slot (which is as difficult to find as the feeder slot was) while slipping the takeup spool into the cassette.
    
    

18. Place the cap back on the film-takeup end of the cassette.
    
    

19. Some early cassettes may require a small strip of tape to keep the cover in place – press the film-takeup cap and cassette together and attach the film-takeup cap with 1/4" black tape. Make sure that ends or kinks of tape are not protruding around the cassette.
    
    

20. Place the reloaded cassette in its protective case and tape shut with black tape.
    
    

21. Mark the outside of the case with the type of film.
    
    

22. If the film won't advance once it's in the camera, most likely it was not properly aligned to the film-takeup spool.
    
    
    

This may sound like a lot of work, but once you get used to it, you can reload a cassette in a matter of seconds.