Here are some photographs I took with the old Russian Cyclocamera 35mm miniature box camera from 1935. This camera doesn't use film in a cassette, instead it just uses the film with no cassette, so I took a standard roll of Ilford-400 35mm film, took it out of the cassette, and loaded it into the Cyclocamera in a dark place (under a blanket in a dark room ;-). I also had to put a strip of black cloth around the outside of the back, held in place with rubber bands, to seal the back door! It worked and the film fed through the camera smoothly without jamming (about 32 exposures on a 20 exposure roll due to the square format). Had to unload it in the dark as well.
Regards, Bill