120 roll film does not get rewound. The wound up take-up spool is removed and taped to prevent unwinding.
Roll films have an adhesive label at the "EXPOSED" end to use for this. The former supply spool is
moved to the take-up spool end and a new film is placed in the supply end (nearest the hinge). The tape is
removed and the end of the backing paper is drawn out far enough to reach the take-up spool slot. Insert the
tab on the end of the paper into the slot into the take-up spool and, with gentle finger pressure on the paper
at the spool, wind the film enough to put two wraps on the take-up spool. Winding is done using the "crank"
(really just a racheting lever) to advance the film. NOTE: Film loading and unloading should be done in subdued
light; if outdoors, one's shadow is generally sufficient. It is also important not to let the rolled film
slacken and unwind, as that can allow light to get into the ends of the roll and fog the edges of the film.