Step 1: What you need
~ 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.
Step 2: Cutting up the 120 spool
Cut the 120 spool in halve, to make two 35mm holders, In the picture you can see the original spool, and the modified holder made from it. You have to cut it so that there is only two spikes that come up above the rest, like the detailed pictures. You must also make the spikes less wide, so that they fit snuggly into the 35mm windy hole.
Step 3: Fitting the modified holder.
The second picture is the other modified holder, used for the original film, it has a rubber band wound in there so that it sits in the right place.
The third picture is both the films with the modified winders, The left will be taped onto the right and pulled into it.