The little plastic latches on my self-shoot/close-up-shot lens broke, so it no longer attaches to the Fujifilm Instax 210. Since I did not think it was worth paying over $15 for a tiny piece of plastic, I decided to repair my own using cheap and available materials---super glue, paper clips, used instant photo cartridges, and magnets!
Cut out a piece of the used instant photo cartridge. I chose the piece in the middle because of its thickness. If you do not have any used cartridges, take some long-distance photos so you make one. Otherwise, any piece of material of the same dimensions will work. It will act merely as a support for the magnet.
Cut them into pieces no wider than 1/16". The length does not really matter as long as it’s around or under 1/2".
Glue the two pieces together, and a small magnet on top of them.
Glue this plastic-magnet sandwich in the crevice indicated below:
Cut a piece of a paperclip (or some other metal piece that responds to a magnet).
Glue it on the camera in the indicated location.
DONE! If you don’t like the way the paperclip looks, you could cut/put stickers on them.