This is only the second 35mm cassette jam I've experienced in fifty-some years and I don't know how many thousands of rolls of film I've shot. The first was easy to see why: the spool had an obvious defect. That was more than thirty years ago! This one is more subtle, but that explanation is all I can come up with since I had to destroy the cassette so I could get the spool out to examine it.
The fresh load I replaced it with I completed on this mornings ride and the camera worked flawlessly throughout. I'll process it in a little bit. 👍
G