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Hello to all, I got a Rotring 900 "side knock" ballpoint pen and I would like to know how the internal mechanism works. I was able to open the pen, but I did not find anywhere on internet an explanation regarding its internal structure, so at the moment not only I am not able to understand its mechanism, but also I do not understand if my pen is broken or not, and if some components are missing. I have not got a refill for this model, and I am not sure on what refill type is compliant to this model. This ballpoint pen is one of the most original I ever saw, and its mechanism is quite original: the barrel is divided in two pieces, and the pen bends in the middle to push out the ballpoint tip. I made some photos after disassembling it, in the end I found only 5 pieces: 1 and 2) the 2 halves of the barrel; 3) the front part, to be screwed with the front part of the barrel; 4) a very strange metal component having an almost conical shape; 5) a very small spring. The metal component was inside the rear part of the barrel, free to move into it. Perhaps it could have to be connected to the spring, like in the photo, but I am absolutely not sure about that. Does anyone know anything about this pen, and in particular what is its internal structure, how many components it has and how its mechanism works? Is my pen broken, are there missing parts? I was not able to find answers till now.... TY very much in advance!!! Ciao Mauro