First thing to do is put about 1/4 drop of liquid super glue at the edges of the screen. Wait a minimum of 24 hours and that little sucker will never fall out again even with aggressive cleaning. Install mouthpiece at an angle, put one edge in first then snap the other in by pushing on the mouffpiece opening. I change them regularly and keep several in a 35mm film container (remember them?) and then clean them all at once by filling container with alcohol.

Mouth piece functions as expected, with prompt shipment. Now, if only I can actually get my Firefly 2+ device repaired, which I have been trying to do for over 1 year, but keep being told the "repair facility" is closed due to Covid-19, and will be "reopening on a few weeks". I might just toss the device in the trash and go back to using my Pax 2, which actually has a responsive support team.

Mouthpieces seem to be fine as expected. The box for the mouthpieces is very small, but they were shipped in a huge box and the charge for shipping was $4! Not cool, not great for the environment either. Took over 1 week to arrive

Perfect extra mouthpieces needed for health and safety. Thank you!

Awesome to warranty mouthpiece that fell out. Replacement seems loose also. May need to be retooled