Sirius Glass
Subscriber
maybe the easiest way would be to hack a 35mm back from a Diana F+ roll film camera. you have everything you need: it attaches to a 120 film wind, it has a rewind and it stops the wind automatically. you have a choice of 4 formats, 2 of them including the sprockets. have a look at my website http://www.plastikcam.com/diana_accessories.htm to see how it looks like.
I have a Welta Reflekta 6x6 from the late 60s which has such a device, but it's complicated to handle and has no rewind, the wind is pure estimation and it's vertical. so it's pretty useless except the fun of a challenge...
You are missing the point. We want to play around with 35mm film in a Hasselblad not a Diana.
