I managed to disassemble and reassemble without directions; I recall it was tricky. Believing it is meant to come apart is half the battle. Only once it is apart does one see how everything fits together.
My favorite version of this: Thirty years ago I had a Pelican fountain pen, and unscrewing it to add ink I accidentally took it apart further than intended. I was stumped for part of an hour how it went back together, till I made the assumption that it was supposed to be reassembled "wrong" in a way that made the ink reservoir a third smaller. It went together in seconds.
I decided to "fix" it, but I wanted a spare of the part I was about to possibly demolish. I called a dozen pen shops around the country (how did one even learn who to call before the internet?). I finally called Fahrney's Pens in Washington D.C., and was put on hold, then their repair guru they normally protect from the public answered: "You won't figure it out. It took me three weeks to make the tool. Just send your pen to me!"
She hadn't even been able to convice Pelican there was a problem. She routinely "upgraded" any Pelican pen she worked on, but I was the first person in the known universe that had noticed this issue, besides her. We were ecstatic to talk with each other.