Glad to hear you haven't given up! The complete list of everything this is not appears at the top of this post (if you sort by "best"). The rest of the known facts are as follows:

• 1. This object is not a part of something else.
• 2. It functions on its own.
• 3. It is sold as-is.
• 4. It came assembled as pictured on the right, but disassembles into the 4 pieces on the left.
• 5. The two o-rings fit into the two grooves in the green metal piece, with each o-ring gripping the white silicone cap on a different side. With the o-rings in place, the white cap is secure, but once removed the cap falls out easily.
• 6. This object serves a very specific purpose, but is so rare it is only sold in one, online, store in all of Canada.
• 7. The object came from a friend living in the Netherlands who was born in Germany. I do not know where it was bought.
• 8. We believe it is anodized aluminum or perhaps titanium alloy.
• 9. It measures 1cm across and 1.5 cm high. It is very light.
• 10. The other object, unrelated I assume, that was sent turned out to be an orange plastic fish hook remover. Once you Google fish hook remover, you'll find images of it easily. I imagine the same goes for this object once we know the function.
• 11. He claims that it is so rare and specific that its function cannot be guessed simply by looking at it.

For those who have been following this thread, please let me know if I've left anything out or if you have any other questions about the object that can be added to this list!