Step 3: Remove internal camera parts
The next step is to remove all the internal parts of the camera. The large plastic thing that the film wrapped around happened to be attached to this camera with two screws (2nd photo below). After removing these two screws and discarding the large plastic piece, I now had access to the shutter mechanism. I didn't take a photo of this mechanism, but it was held on by one screw. I removed the screw and discarded the shutter. This left me with a camera housing that was essentially bare, but in order to fit my webcam inside I had to use the rotary tool to remove some of the molded plastic in side the front of the housing (3rd photo). This was sort of a "trial & error" process. I would grind a little, test fit the webcam, then grind a little more until I got a good fit.
During this process I also enlarged the hole at the front of the camera where the lens was removed. To fit my particular webcam, I had to enlarge the hole to a 1 1/8" diameter. It wasn't necessary to get this hole perfectly round, since the metal plate on the front of the camera would cover it, and the original hole in the metal plate was already the perfect size for the webcam.