My previous post told how to re-spool 620 film from 120 film. The 620 size film is now obsolete, as far as I know. At the time of this post, their are still alternative sources for 127 film. But you may wish to cut down and re-spool 120 film onto 127 spools. This will give you a wider variety of film emulsions, as 120 film is still widely available.
127 film size, which Kodak introduced during the first decade of the Twentieth Century, was used for their earliest folding vest-pocket camera. The film enjoyed pretty steady usage and then took off again with the advent of the TLR Baby Rollei 127 and various copies. It was discontinued when it no longer became popular. At the time of this writing, there are still manufacturers who make limited types of film in the 127 format. But you can roll-yer-own from 120 film and backing if you have a few empty spools, or you can make your own spools as suggested in the previous post.
The following cam-video will help understand this process. I will try to find the eBay supplier of the simple film cutter that I use in the video. But if I can't, just use the visuals to make your own. Ingenuity goes a long way in photography. Now the video: