I believe I sold a friend one of my bubble memory cartridge, or for some other reason I ended up with a single cartridge, so I wanted to get a second one, but I didn't want to pay too much money. I had a good plan, but executed it poorly, so it ended up more expensive than I had imagined. But I do at least have two bubble memory cartridges now!

While messing around with FM-8s, I had need to uninstall the bubble holder units, so I decided to photograph one in more detail and provide a closer look at them.