Where I am, It is hard to develop 120 film, and it would be much more simpler to use 35mm in my 120mm Diana. This is a simple and free method of using 35mm film in a 120 camera.
Step 1: What you need
All you need for this is:
~ One used roll of film.
~ A 120mm film spool
~ Some buttons or something that can be used as a spacer underneath the roll to hold it in place.
~ Obviously a new roll of film, in this Intsructable I am using some Kodak slide film.
~ A 120 camera, I am using the Diana, but I'm pretty sure you can use any 120 camera, but it depends whether the 35mm film will fit
~ Some kind of wire cutters or other cutters that you can cut the plastic.