Rewinding a used 120 film starting on the first frame for double exposure?

I have used a roll of 120 film. I finished shooting one exposure for each frame and reached the end of the roll, taking note of the shots I already took in the woods. I would like to do double exposure on it starting with Frame 1.





How do I rewind the film back to start shooting again from the start in a different location?





I would appreciate any kind of help on this.





In case there are tips, I am using a Diana F+ camera.|||That's a tough one.





OK, it's theoretically a simple matter of going into a dark place, and unspooling the film and rewinding it. But theory and practice often differ.





There are two serious problems. The first is that 120 roll film is attached to a paper carrier strip, and as it passes through the camera, it is wound onto a separate spool. When the roll is completed, the metal spool it is on is not the same spool that it came on from the factory. And factory film is rolled with exposure one at the end of the spool, and exposure 12 closest to the center of the spool, but when the film is removed from the camera, exposure 1 is closest to the spool, and exposure 12 is at the end. So you will need to physically unwind the entire strip of film, and then rewind it on the spool. Sounds easy, but the issue will be keeping the film and paper strip together. They are taped together at the beginning (the end near exposure 1), but otherwise they are separate. You will need to make sure that the film remains attached to the paper strip. When you respool the film, the end closest to exposure 12 must go on the spool first, and the problem will be that there is nothing at that end to hold the film in position against the paper.





The second problem is the issue of registration. When you do double exposure, you usually want to have some control over the placement of the superimposed images. But in a Diana, all you have to go by is the number printed on the back of the paper strip as viewed through the red window. Unlike 35mm where you have notches that are captured in a ratchet, there is nothing to assure that you have respooled the film, and then reloaded the film in the camera, such that frame 1 is actually in position behind the lens when you do the double exposure.





With roll film, it would probably be better to do the superimposed exposures together. That is, do both exposures on frame 1 before advancing to frame 2. And when you get to the end of the film, take it out and process it rather than trying to run it back through the camera a second time.|||Usually it's better using a light tight bag. Anyhow it will be difficult, for not saying impossible, making coincide first and second exporures in the same frame. Double exposure is usually made just clicking twice, turning on the clutch if the camera allows it. Or just click clik in Holga %26amp; co|||You will have to go into a complete dark place and re-spool the film back on its original spool. NO light can be in the room when you do this, not from under the door or anywhere....